1998 Upper Deck Intensity Stephon Marbury Quantum Bronze #I29
1998
See all Stephon Marbury cards & values$2.99est. value (ungraded)
Prices updated 2026-10-20
Based on recorded sold prices how we price cards
Stephon Marbury price history
PSA 10 market value, one reading a day. One-day spikes that reverse the next day are left out.
Price by month
Average price of the 1998 Upper Deck Intensity Stephon Marbury Quantum Bronze #I29 each month, from 1 recorded price reading. Prices are re-checked regularly; a month's average counts each day from that month's first reading at the price that held that day.
| Month | Source | Average | Range |
|---|---|---|---|
| Oct 2026 | Market value | $2.99 | — |
Stephon Marbury prices by grade
| Grade | Value | eBay |
|---|---|---|
| Ungraded | $2.99 | Buy on eBay ↗ |
| PSA 8 | $11.17 | Buy on eBay ↗ |
| PSA 9 | $22.45 | Buy on eBay ↗ |
| Grade 9.5 | $39.52 | Buy on eBay ↗ |
| PSA 10 | $100.75 | Buy on eBay ↗ |
| BGS 10 | $131.00 | Buy on eBay ↗ |
| CGC 10 | $60.00 | Buy on eBay ↗ |
| SGC 10 | $60.00 | Buy on eBay ↗ |
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Affiliate — we may earn a commission1998 Upper Deck Intensity Stephon Marbury Quantum Bronze #I29 value & prices
The 1998 Upper Deck Intensity Stephon Marbury Quantum Bronze #I29 is a Basketball card (Quantum Bronze parallel) released in 1998. Ungraded copies carry a market value of about $2.99.
An ungraded copy is worth around $2.99, a PSA 9 around $22.45, a PSA 10 (Gem Mint) around $100.75 and a pristine BGS 10 around $131.00. That's roughly a 34× premium for a gem-mint copy over raw — one of the clearest signals that condition-sensitive buyers dominate this card's market.
Is it worth grading?
With raw copies near $2.99 and top grades reaching $100.75, grading a sharp copy of this card can clearly pay for itself — the spread comfortably covers a typical ~$25.00 grading fee. The catch: only submit copies with strong centering, clean corners, and unmarked surfaces, because anything below a 9 usually erases the math.
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