This company does awesome work. He's a member of Scinergy So Cal (koolxb) and his stuff looks great. I'll post pics of the work he's done for me in a few days when it's all done. http://www.g5designs.com/
2 places used by the Iowa clubs come to mind, 1st and closest to you would be FastTrack Graphics in Ames, and then for really wild and crazy stuff check out Precision tint and Graphics/Wheelart.net in Cedar Rapids. They do some really cool work. and give Scinergy members pretty good prices....
Fasttrack does good work. Ive seen the Scinergy stickers and theyre damn good.
The place I would actually recommend you to however is High Impact Racing in Bellevue. Its right next to Joann Fabric/Army Surplus/ Bellevue Toyota on Fort Crook there. Its in that little strip mall. I forgot the owners name, but hes a real cool guy thats done some work for me. Him and I believe his brother own it. Theyre pretty decent for the price from what I hear. Ive never had him do vinyl work for me, but I know he will do it. Tell him Scotty with the Silver/White xB sent ya. Dont know if itll help, but its worth a try.
Any questions, just PM me.
Also, are you going to the reformation of Scinergy NE on July 30th at Dave and Busters? Should be a good time!