I order 18x9 1/2 roush wheels .now what size tires do I need and the cheaps place to get them? I check prices here are SCARY like 254.65 a pcs. I hope this does not hold true ever where.

 

Michelin Pilot LTX all the way. 285/60/18 or 285/55/18 depending on what speed rating you prefer and what kind of clearance you have. Search around if you like and you'll find many a happy customer who have used these tires. Usually a reasonable price as well, under 200 depending on where you go
Good luck!