Whole unit can be brought for $90, rear wheels about $60 posted to replace, great little market there :( Unfortunately after 3 days of use for the purpose they are designed for, sliding around on roads, the wheels have worn through, need to replace them cheaply, or take it back I guess because I can't afford $60 a week for plastic wheels.
G
mods for these use PVC pipe for wheels. will last heaps longer but not cheap. if your gonna hammer them out on the open roads will be the best option tho.