I always grab key fobs I find at the u-pick junkyard, usually they are all for sale up at the office but you still find them occasionally. have a pretty good box going to sell.
as for the big $$, definitely the C4 vette fob's go for good money, and so do the big tire pressure monitors from those cars--the ones that are strapped inside the rim. I actually sold my fobs to a guy online for $200 years ago because I disabled the PASS feature since the computer was malfunctioning. guys that want their cars original/restored will pay good money for those...
I only know vette's (cuz I have 3), but I bet a lot of the sports cars from the 90's or so bring good money for the early generation passive keyless entry fob's. problem is a lot of time when you find them you don't know what they are for. at least the corvette fob's have the flags on them to make it easy to ID.
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