[Chewbaccus]

A jumper pak is the RAM cartridge that comes with the 64, it's that little black rectangle under the little panel in the front of the console. For some of the later games, they'll run best if you get an Expansion Pak to replace it. Games like Rogue Squadron will run without it, but with less in the way of graphics quality than if it ran under the Expansion Pak. I think games from LoZ: Majora's Mask to the end of the console's lifespan need the Expansion Pak to run at all. Contrarily, early titles like Turok: Dinosaur Hunter and Shadows of the Empire can't run with the Expansion. Go figure.

vsp's right - EBs and GameStops all over carry used titles and accessories for the last-gen consoles. And, because they're used, the prices are very affordable.

BN's suggestions are good deals: GoldenEye is fucking mandatory to own if you're going to own a N64. Smash Bros. and Mario Kart are good stuff too. For some good single-player-only action, snag Rogue Squadron, Legend of Zelda: Ocarina of Time and Majora's Mask, and Mario 64. RS is a better flying game than StarFox 64 if you're looking for something to take that Rumble Pak for a spin. If you have to pick between the two Zelda games I highly recommend you get Ocarina over Majora. Majora's good, but Ocarina is just a superior game. And Mario 64 should be gotten, if for nothing else than to see Mario in 3D. Trippy.