on ebay i have gotten 3 wacom tablets: a 9X12 that works great on my PC for $20!!! won't work on my iMac though.
the first one: the smallest 4X5 i think, intuos pad, loved it, still works for $50 on ebay in 2000.
the last one was my travel one that i use on my iMac right now until i can afford a bigger one on ebay: 4X5 plug and play graphis pad. works great, not as great as my other two, but VERY good and VERY servicable... $32 on ebay new in box.
Half of the failures in life come from pulling one's horse when he is leaping.