I am currently in a country where there are still Nintendo classic minis for sale. In my own country they are sold out literally everywhere. My birthday is in two months, but I have no guarantee that it'll be available then. Should I just buy it?

I have a 2ds and I just want ideas for good speedrunning games on that console

I want to speed run Mario 64 some time in the future and I have a chance to buy a cheap N 64 with the game. Should I buy it?

I am new to speedrunning and I want to ask what games are the best to get me started. I enjoy classic Nintendo games and some 3D platformers. I have a few consoles ( WII, DS, 2DS, gameboy and PlayStation 3 and 4) but I am prepared to buy some older consoles. I am entirely new to this so I can use all the help I can get.

Thanks in advance, Haze