Speaking of this game...
My brother recently went to a local retro video game store at the mall and saw a copy of BB2 in loose but mint condition under their glass counter for $220. He had wanted to add it to he new NES collection (He is 23 and just starting out with it). After talking to the clerk there and snagging a couple of cheap games such as Pinball and Mach Rider for $4 each, he left.
Down the road is a new casino so he went in, signed up, and used $20 in credits they gave him as a new member bonus - he ended up winning $265 on the slots with that money.
He then went back next door to the store at the mall where he was greeted by the clerk with a chuckle and "Haha, back for that Bubble Bobble cart?"...placed the wad of bills on the counter and walked out with the cart. He said that the clerk was literally

WTF.
It is the highlight of his collection to say the least.