I used to do 100cc kart's, back in the day, i tried doing it on a shoestring budget, used to transport it on a roofrack ontop of my Nova GTE, used to go to Rye House. Used second hand Super1 tyres to keep costs down but 6hrs before and engine rebuild was a killer, that's if it lasted 6hrs, which it rarely did.
A day karting used to cost me in excess of £100, bearing in mind that was 16+ years ago!
My wife used to race Mini's and was East Anglian grass track champion many years ago, and we keep toying with the idea of getting a cadet kart for my daughter, but other thing's keep cropping up to ***** out spare cash on! lol maybe one day