As of August 2026, CarSearch.Pro's True Value model estimates a typical Buick Grand National/GNX is actually worth $50,300 (fair range $44,300 to $56,400). Unlike the median asking price shown above, True Value is anchored to 88 recent confirmed sales, normalized for mileage, and blends auction hammer prices (grossed up for buyer's premium) with real-world asking behavior.
Asks running above recent sales · momentum improving — but volatile.
As of August 2026, the Buick Grand National/GNX market has 106 active listings across 14 marketplaces tracked by CarSearch.Pro. The median asking price is $49,995, with the middle 50% of listings priced between $39,000 and $62,995. Buick Grand National/GNX prices have increased 21.9% over the past quarter, from a median sale price of $47,500 to $57,900.
The typical Buick Grand National/GNX on the market has 51,485 miles. Listings spend an average of 81 days on market before selling or being removed.
A fair price for a Buick Grand National/GNX in August 2026 is between $39,000 and $62,995 (25th to 75th percentile). Prices range from $23,499 to $79,997 across 106 active listings.
| Percentile | Price | Meaning |
|---|---|---|
| 10th | $23,499 | Budget / project cars |
| 25th | $39,000 | Below average price |
| Median (50th) | $49,995 | Typical market price |
| 75th | $62,995 | Above average / premium |
| 90th | $79,997 | Top tier / low miles / rare spec |
The average asking price is $59,702, which is higher than the median, indicating that high-priced outliers (rare specifications, very low mileage, or concours-quality examples) pull the average up.
| Mileage Range | Listings | Median Price |
|---|---|---|
| Under 10,000 mi | 14 | $89,100 |
| 10,000 - 25,000 mi | 6 | $67,250 |
| 25,000 - 50,000 mi | 22 | $60,000 |
| 50,000 - 100,000 mi | 33 | $52,499 |
| 100,000 - 150,000 mi | 14 | $42,500 |
Buick Grand National/GNX prices have increased 21.9% over the past quarter. In 2026-Q3, the median sale price was $57,900 across 16 sales, up from $47,500 in 2026-Q2.
On a year-over-year basis, Buick Grand National/GNX prices are up 17.0% ($57,900 vs. $49,500 a year ago).
| 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 | 32 | $47,500 | $50,570 |
| 2026-Q3 | 16 | $57,900 | $55,197 |
The 1984 Buick Grand National/GNX offers the best value with a median price of $29,950 across 4 listings. The most expensive model year is 1987 at a median of $54,000.
| Year | Listings | Median Price | Min | Max |
|---|---|---|---|---|
| 1984 | 4 | $29,950 | $4,500 | $38,999 |
| 1985 | 7 | $35,000 | $7,500 | $49,500 |
| 1986 | 20 | $51,860 | $4,000 | $219,900 |
| 1987 | 75 | $54,000 | $3,500 | $398,429 |
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 31,518 miles:
| Odometer (approx.) | Value Multiplier | Implied Value |
|---|---|---|
| 686 mi | 1.68x | $84,434 |
| 5,055 mi | 1.34x | $67,550 |
| 10,568 mi | 1.15x | $57,901 |
| 20,483 mi | 1.05x | $52,827 |
| 40,392 mi | 0.96x | $48,045 |
| 64,674 mi | 0.82x | $41,093 |
| 91,277 mi | 0.71x | $35,764 |
| 154,919 mi | 0.43x | $21,675 |
| 300,000 mi | 0.37x | $18,656 |
Low-mileage examples carry a real premium in this market: around 686 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.
| Horizon | Direction | Probability | Regime | Past Accuracy |
|---|---|---|---|---|
| 6 months | ↑ UP | 54% | volatile | 63% over 115 tests |
| 12 months | ↑ UP | 55% | volatile | 69% over 109 tests |
| 24 months | ↑ UP | 58% | volatile | 81% over 97 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 →
The highest concentration of Buick Grand National/GNX listings is in IL with 10 active listings, followed by NY (9), NJ (8), FL (8), TX (6).
Regional pricing varies significantly. The lowest median price is in NH at $29,950, while FL has the highest at $66,000. Buyers willing to travel or arrange transport may find savings of $36,050.
| State | Listings | Median Price |
|---|---|---|
| IL | 10 | $49,995 |
| NY | 9 | $55,200 |
| NJ | 8 | $46,000 |
| FL | 8 | $66,000 |
| TX | 6 | $59,950 |
| GA | 5 | $48,000 |
| CA | 4 | $39,995 |
| IN | 4 | $45,000 |
| NH | 3 | $29,950 |
| WA | 3 | $45,000 |
Buick Grand National/GNX listings spend an average of 81 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 37 days. The lower median suggests most cars sell relatively quickly, while a smaller number of overpriced listings drag up the average.
Ready to start shopping? Browse all 106 Buick Grand National/GNX listings with AI quality scores, or get a free AI appraisal on a specific listing.
Data sourced from 7 marketplaces including eBay Motors, Bring a Trailer, Cars & Bids, AutoTrader, CarGurus, Cars.com, Facebook Marketplace, Classic.com, and Hagerty Marketplace. Updated daily by CarSearch.Pro's automated pipeline. Browse all 106 active Buick Grand National/GNX listings. Read the latest Buick Grand National/GNX market analysis.