The sale is probably over. I think it ended on the 15th.

But if you keep an eye out every now and then Radio Shack does a $20 rebate on the Xmods. Some cars are $40 and some are $50 so with the rebate it's a really good deal.

The price difference doesn't matter....both cars are the same. I think the cost is just do to the official licensing. Some brand licensing costs more then others.