Check out Ridemakerz in the US.
http://ridemakerz.com/shop/list/stock
Jack got 2 Challengers there, (Disney Florida) which are R/C.
You basically go into the shop, choose a body, chassis, and all the bits you want to spec it up, then build it on a workbench in the shop, then Dad pays with the credit card.
they are good, new shape Chally, Mustang, Camaro, Ram, Viper plus the Cars movie cars.
Jack bought one running chassis and an extra rolling chassi with no R/C, so can swap them over.
These are not Tamiya R/C quality but quite good fun.