As of October 2026, CarSearch.Pro's True Value model estimates a typical Buick Grand National/GNX is actually worth $47,700 (fair range $42,000 to $53,400). Unlike the median asking price shown above, True Value is anchored to 90 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 $55,000 — about 15% above what these cars have actually been selling for. That gap favors patient buyers: negotiate from the sold data, not the ask.
As of October 2026, the Buick Grand National/GNX market has 88 active listings across 14 marketplaces tracked by CarSearch.Pro. The median asking price is $57,949, with the middle 50% of listings priced between $42,000 and $71,900. Buick Grand National/GNX prices have increased 5.3% over the past quarter, from a median sale price of $47,500 to $49,995.
The typical Buick Grand National/GNX on the market has 42,738 miles. Listings spend an average of 87 days on market before selling or being removed.
Current Buick Grand National/GNX Pricing
A fair price for a Buick Grand National/GNX in October 2026 is between $42,000 and $71,900 (25th to 75th percentile). Prices range from $34,863 to $89,100 across 88 active listings.
Price Distribution (88 Active Listings)
Percentile
Price
Meaning
10th
$34,863
Budget / project cars
25th
$42,000
Below average price
Median (50th)
$57,949
Typical market price
75th
$71,900
Above average / premium
90th
$89,100
Top tier / low miles / rare spec
The average asking price is $66,890, 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
16
$89,100
10,000 - 25,000 mi
11
$67,250
25,000 - 50,000 mi
18
$65,100
50,000 - 100,000 mi
34
$42,900
100,000 - 150,000 mi
5
$41,500
Buick Grand National/GNX Price Trends
Buick Grand National/GNX prices have increased 5.3% over the past quarter. In 2026-Q3, the median sale price was $49,995 across 31 sales, up from $47,500 in 2026-Q2.
On a year-over-year basis, Buick Grand National/GNX prices are up 1.0% ($49,995 vs. $49,500 a year ago).
Buick Grand National/GNX Quarterly Sale Prices (Historical)
Quarter
Sales
Median Price
Average Price
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
60
$48,000
$53,207
2026-Q2
33
$47,500
$50,854
2026-Q3
31
$49,995
$49,322
Best Value Buick Grand National/GNX by Model Year
The 1987 Buick Grand National/GNX offers the best value with a median price of $54,033 across 62 listings. The most expensive model year is 1986 at a median of $69,900.
Median Price by Model Year
Year
Listings
Median Price
Min
Max
1984
2
$35,000
$27,500
$35,000
1985
2
$25,000
$15,250
$25,000
1986
22
$69,900
$39,500
$219,900
1987
62
$54,033
$17,000
$399,999
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 30,000 miles:
Odometer (approx.)
Value Multiplier
Implied Value
686 mi
1.66x
$79,165
5,055 mi
1.33x
$63,329
10,721 mi
1.12x
$53,251
20,548 mi
1.06x
$50,628
40,212 mi
0.94x
$44,756
65,341 mi
0.82x
$39,025
93,672 mi
0.77x
$36,545
154,919 mi
0.46x
$21,775
300,000 mi
0.31x
$14,923
Low-mileage examples carry a real premium in this market: around 686 miles, cars trade at roughly 1.66x the reference value. At the other end, 300,000-mile examples trade at about 0.31x. 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
53%
volatile
64% over 117 tests
12 months
↓ DOWN
45%
volatile
73% over 111 tests
24 months
→ FLAT
50%
volatile
89% over 99 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 FL with 13 active listings, followed by IL (8), NY (6), CO (4), NJ (4).
Regional pricing varies significantly. The lowest median price is in WA at $45,000, while TX has the highest at $69,995. Buyers willing to travel or arrange transport may find savings of $24,995.
Top States by Inventory
State
Listings
Median Price
FL
13
$65,100
IL
8
$47,650
NY
6
$57,949
CO
4
$49,963
NJ
4
$47,000
TX
3
$69,995
WA
3
$45,000
CA
3
$65,000
SC
2
$54,033
MD
1
$15,250
Buick Grand National/GNX Market Velocity
Buick Grand National/GNX listings spend an average of 87 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 59 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: $42,000 to $71,900. The median is $57,949. Anything below $42,000 is a strong value; above $71,900 should be premium condition, low miles, or a desirable specification.
Trending up: Buick Grand National/GNX prices have risen 5.3% recently. Buying sooner may save money if the trend continues.
Best value year: The 1987 model year has the lowest median price at $54,033, making it the most accessible entry point into Buick Grand National/GNX ownership.
Negotiate: With an average of 87 days on market, sellers are often willing to negotiate. Listings over 60 days old are especially open to offers.