Everyone collecting is always looking for undervalued cards they could see flipping for a big profit. Whether you're a collector or a flipper, the thought always crosses your mind. However, for cards ...

The last time his Rookie Silver Prizm in a PSA 9 sold at auction was on October 6, closing at just $20. Fast forward to today, and that same card is now worth between $60 and $70, a massive jump in ...