I have one of those older Tamiya trucks. Its pretty fast for stock.....but I want to to go faster....What motor should I get thats CHEAP?

Its a tamiya TA-06 i believe

try the Team Orion Method R modified motor . I bought one for my traxxas rustler, it's an awsome motor . the one I bought costed $22.00 . Here is the specs on my motor , it is a 15 turn motor,the max rpm is 31,635, and it has 128 watts of power . It has team orion's new SV2 design built into it, which means less maintence for the motor . plus it will smoke most of the motors that cost alot more money. for more specs go tower hobbies, and tower hobbies has this motor for $14.00 . For the money, this is an awsome motor .