Try Craig's List.
go to a go kart store or ebay!
At a go kart place
well what you need to do is go to a go kart hire place and ask them if they have any forms tho become a go kart race or you can go to a moterbike shop
you dont make a kart you go to grand prix or any racing place choose your character pick a kart and ready set go your done.
yerf dog
There are many places to go Go Karting all over the world. A few of the well known places are Town Bridge Go Karting in the United Kingdom and Best Go-Kart Racing in Chicago.
you dont want cheap you still want a good kart so i wpuld recommend $ 100
If you get lucky, it could be $3 or $4. I would advise to go elsewhere is you're at least going to sell something. The only reason why you should sell Mario Kart 7 to Gamestop is that you really need the money right then and there.
The best place to go is Gamestop they have a lot of them.
In terms of price and durability, this is the best professional engine.
personally, i recommend Yoshi in his egg 1 kart. but you should go with whatever you are best with.
A skate park because the ramps and slides in there are really fun if you're in a go kart.