Not got one for sale but very budget friendly option
Turnigy 2wd Sct roller £55 ish new
I thought they'd be aweful at that price but got one in a swap and it's been awesome taken it over massive ramps and given it some proper stick as I'll be buying a new one and using old one for parts so not worried about breaking it and so far all I've broken is spur gear which I replaced for a traxxas one