Prospect Card Radar tracks live eBay asking prices for the top 100 MLB prospect cards across every major product line. Unlike price guides that rely on stale data or just graded comps, this shows what cards are actually listed for right now, both raw and graded. Compare two products side by side for the same player, track how prices move over time with trend charts, and click straight through to eBay listings. Free, no sign up, no paywall, no ads.