No but if you have a laptop and download a N-64 emulator, you can have a portable N-64. You can download emulators from doperoms.com and coolroms.com
No. One Nintendo 64 cartridge is about the size of a DS.
Nintendo shop
Gamestop or Best Buy.
eBay is the best place to find games for the Nintendo 64.
ebay or craigslist.
There is no retail portable GameCube. The portable GameCube consoles that you see are fan-made, and thus, aren't for sale.
The Wii for sure. It has better games, a lot more innovative controls and a vast spectrum of games that allows more people to become gamers in their own style.
You can buy replacement cables on ebay.
I don't think so.
if you buy the system seprate from the controller its $16 and when you buy the controller with its $25
in a computer with a emulator, or buy it for Nintendo 64