That's a tough question. Does best purchase mean the toughest item I've gotten? The biggest differential between paid price and card value? The one I waited for the longest? I can't decide...
I got this 1928 PCL Earl Averill on the cheap at a local show:
Pulled this out of a miscellaneous junk box at a show:
This card routinely goes over $100 due to the Lon Chaney fans; got it for $5 at a show:
This wasn't cheap--around $90--but Capital Candy athletes are about as tough as Mono Cigarettes baseball cards:
Only 1 of these has surfaced thus far in all my years of boxing card collecting and I got it on Ebay before anyone realized how rare it was:
The 4 on 1 Exhibit cards with this art are tough; the strip cards made from the same art are nearly impossible, but I have one; never seen another, though I have seen 3-4 cuts from the Exhibit cards:
How do I know it is a strip? Besides being on different stock, the set was mixed sport and nonsport and these surfaced: