Have a look at this
http://www.ebay.co.uk/itm/Associated...item5ae20e6caf
I know it's not the full version of the b4.1 but it is on budget for the guy & only needs a battery to put you on the grid
It would at least give you a idea if it's the kind of thing you want to do, grasshoppers & hornets have had their day & although you can have a lot of fun in the park with them they can't compete against todays cars
Whatever you choose have fun & enjoy it