Lefty,
I'm afraid I can't afford a 4004, either back in 197x or now. There was a time when a white chip with gold stripes sold for $1,000USD. Then the supply exploded as many found out trashed medical equipment from that era have lots of those chips so the price has gone down but I don't have the slightest idea how much.
I suggest next time you see one of those, steal the whole bin! My gestimate is maybe $100 Depends On Condition. I'd be happy trading my board for 8080s or 8088s, all the way up to pentiums. 8088 has large supply so it's just a few bucks for a plastic dip and a ceramic one could fetch a bit more. So anything I can afford? :
