At Discount Hobby Warehouse they have a Duratrax Tazer 15 for 29.99 plust tax. This is the cheapest in the market, but only 15T. LHS people did not recomend it because it has limited features.
Here is the link.
http://h1070621.hobbyshopnow.com/ser...turer=ALL&tag=
If you want to go with a fast motor, you got to get a quality ESC that can handle it.
Here are some recomendations
http://www.hobbypeople.net/gallery/551747.asp (Novak GTS 12 t motor limit @ 79.99)
http://www.hobbypeople.net/gallery/383430.asp (LRP A.I. Auto Pro Reverse ESC - Over 10 T @ 69.99)
http://www.hobbypeople.net/gallery/159210.asp (Viper Tempo 11 - 11 T @ 49.99)
That motor you want cost around $80.00 already, and you want something around $30.00 for an ESC.
Hope this helps.