As of July 2026, CarSearch.Pro's True Value model estimates a typical Buick Grand National/GNX is actually worth $48,300 (fair range $42,500 to $54,100). Unlike the median asking price shown above, True Value is anchored to 71 recent confirmed sales, normalized for mileage, and blends auction hammer prices (grossed up for buyer's premium) with real-world asking behavior.
Sellers are currently asking a median of $52,800 — about 9% above what these cars have actually been selling for. That gap favors patient buyers: negotiate from the sold data, not the ask.
As of July 2026, the Buick Grand National/GNX market has 99 active listings across 14 marketplaces tracked by CarSearch.Pro. The median asking price is $52,750, with the middle 50% of listings priced between $45,000 and $60,500. Buick Grand National/GNX prices have decreased 4.5% over the past quarter, from a median sale price of $43,950 to $41,987.
The typical Buick Grand National/GNX on the market has 50,811 miles. Listings spend an average of 89 days on market before selling or being removed.
Current Buick Grand National/GNX Pricing
A fair price for a Buick Grand National/GNX in July 2026 is between $45,000 and $60,500 (25th to 75th percentile). Prices range from $39,985 to $79,997 across 99 active listings.
Price Distribution (99 Active Listings)
Percentile
Price
Meaning
10th
$39,985
Budget / project cars
25th
$45,000
Below average price
Median (50th)
$52,750
Typical market price
75th
$60,500
Above average / premium
90th
$79,997
Top tier / low miles / rare spec
The average asking price is $59,330, which is higher than the median, indicating that high-priced outliers (rare specifications, very low mileage, or concours-quality examples) pull the average up.
Price by Mileage
Mileage Range
Listings
Median Price
Under 10,000 mi
17
$52,754
10,000 - 25,000 mi
10
$70,100
25,000 - 50,000 mi
20
$59,900
50,000 - 100,000 mi
35
$49,990
100,000 - 150,000 mi
13
$49,987
Buick Grand National/GNX Price Trends
Buick Grand National/GNX prices have decreased 4.5% over the past quarter. In 2026-Q2, the median sale price was $41,987 across 13 sales, down from $43,950 in 2026-Q1.
On a year-over-year basis, Buick Grand National/GNX prices are flat 0.0% ($41,987 vs. $41,987 a year ago).
Buick Grand National/GNX Quarterly Sale Prices (Historical)
Quarter
Sales
Median Price
Average Price
2024-Q3
41
$44,000
$45,601
2024-Q4
47
$40,000
$37,455
2025-Q1
30
$49,500
$50,933
2025-Q2
13
$41,987
$44,257
2025-Q3
27
$49,500
$54,691
2025-Q4
40
$40,250
$47,368
2026-Q1
44
$43,950
$54,839
2026-Q2
13
$41,987
$46,630
Best Value Buick Grand National/GNX by Model Year
The 1986 Buick Grand National/GNX offers the best value with a median price of $49,995 across 14 listings. The most expensive model year is 1987 at a median of $54,994.
Median Price by Model Year
Year
Listings
Median Price
Min
Max
1984
2
$13,000
$4,500
$13,000
1985
1
$36,900
$36,900
$36,900
1986
14
$49,995
$9,700
$219,900
1987
82
$54,994
$17,125
$300,000
How Mileage Affects Buick Grand National/GNX Value
Most price guides assume value falls linearly with mileage. It doesn't. CarSearch.Pro learns the actual price-vs-mileage curve for the Buick Grand National/GNX from confirmed sales, referenced to a typical example at about 27,451 miles:
Odometer (approx.)
Value Multiplier
Implied Value
652 mi
1.68x
$81,380
5,412 mi
1.34x
$64,586
11,769 mi
1.16x
$55,977
20,506 mi
1.01x
$48,723
40,665 mi
0.96x
$46,145
64,960 mi
0.81x
$39,114
89,992 mi
0.78x
$37,460
154,919 mi
0.40x
$19,361
300,000 mi
0.37x
$17,999
Low-mileage examples carry a real premium in this market: around 652 miles, cars trade at roughly 1.68x the reference value. At the other end, 300,000-mile examples trade at about 0.37x. Implied values here are anchored to this market's True Value.
Buick Grand National/GNX Price Forecast
Horizon
Direction
Probability
Regime
Past Accuracy
6 months
↑ UP
54%
volatile
60% over 108 tests
12 months
↑ UP
55%
volatile
68% over 102 tests
24 months
↑ UP
58%
volatile
81% over 90 tests
These are probabilistic direction calls, not price targets. The "Past Accuracy" column is this model's real walk-forward record on the Buick Grand National/GNX — every month we re-run the forecast as if we only knew what was knowable then, and grade it against what actually happened. We publish the hit rate either way. Full methodology & track record →
Where to Buy a Buick Grand National/GNX
The highest concentration of Buick Grand National/GNX listings is in IL with 8 active listings, followed by FL (7), NY (7), MI (4), GA (3).
Regional pricing varies significantly. The lowest median price is in MI at $44,988, while FL has the highest at $79,997. Buyers willing to travel or arrange transport may find savings of $35,009.
Top States by Inventory
State
Listings
Median Price
IL
8
$52,754
FL
7
$79,997
NY
7
$50,000
MI
4
$44,988
GA
3
$55,000
WA
2
$300,000
NE
2
$59,000
TX
2
$189,900
NJ
2
$47,990
CA
2
$30,000
Buick Grand National/GNX Market Velocity
Buick Grand National/GNX listings spend an average of 89 days on market. This is a slow-moving market. Listings tend to sit for extended periods, giving buyers significant negotiating power. Sellers should be realistic on pricing and patient.
The median time on market is 57 days. The lower median suggests most cars sell relatively quickly, while a smaller number of overpriced listings drag up the average.
Buick Grand National/GNX Buyer's Guide Summary
Fair price range: $45,000 to $60,500. The median is $52,750. Anything below $45,000 is a strong value; above $60,500 should be premium condition, low miles, or a desirable specification.
Trending down: Buick Grand National/GNX prices have dropped 4.5% recently. Patient buyers may benefit from waiting, but desirable examples still sell quickly.
Best value year: The 1986 model year has the lowest median price at $49,995, making it the most accessible entry point into Buick Grand National/GNX ownership.
Negotiate: With an average of 89 days on market, sellers are often willing to negotiate. Listings over 60 days old are especially open to offers.