Here's some that I've had the fortune to acquire:
1956 Topps Luis Aparicio (got it for 35$ delivered)
1990 Topps Debut Promo Alex Fernandez (3$ on eBay. It was given out at the golden spike award dinner in NYC most likely hand cut from a single sheet)
1959 Bazooka Fox (3$ on ebay - an antique dealer in Michigan didn't know what he/she had for they did not put Fox or Bazooka in the auction title or description. I sure was nervous and tense until the auction was over but did the happy sox fan dance when I won. Best deal I've ever had)
1951 Bowman Fox (His rookie card - enough said)
1977 Sertoma Stars Fox (harder to find than you might think)
1996 Illinois Lottery Ticket Carlton Fisk (I think most were thrown away. It took me five years to find on eBay)
1967 Tommy John (the last card in the set and hard to find at a affordable cost)
and
last but not least
2001 Donruss Classics Legendary Lumberjacks LL4 Nellie Fox
(I like this card a lot. It's my favorite Fox card.)