The problem with the Nintendo 64 is that some stores charged more than the MSRP, probably due to razor-thin profit margins. This mostly happened around launch, taking advantage of the scarcity of the system and games. The MSRP for Nintendo-published titles was $59.99 until a couple years in, then when the PlayStation shot ahead most games were $49.99, with Player's Choice being $39.99. I can't really speak for third-party games since I bought mostly Nintendo titles when the Nintendo 64 was current, but I wouldn't be surprised if some companies charged more than $50 or even $60 due to the high royalties and manufacturing costs. I do know I never saw a game for more than $60 meself (Donkey Kong 64 excluded).