I emailed a local college and had their graphic design ag communications class do it as a competition. I have done this for my farm as well as a couple of my other business. I explained to the class what I do and gave them a little direction and was very pleased with the results. I had several options and just picked the one I liked best. Then I made a $100 donation to the class and I think the professor got everyone lunch.
As XBar said, it really depends on how complex you want it... I myself am just starting out and it would range anywhere from 80-150 depending on the complexity of it all.