a "cheap" conversion? there is no such thing. unless you have the time and abilities to spend multiple evenings machining, tig welding, fabricating, experimenting and attempting to jury rig some garbage atop your factory upper triple clamp then go with either of the below. tried and proven but you're paying for not only quality parts but their R&D to develop same.
nicecycle.com/conversions
LSL superbike conversion kits
http://www.motoworldonline.com/LSL-S...08_p_2187.html