As we are currently internally developing a new product, we needed a logo for it. Beside the many sites that offer you to design a logo in less than three days I also came across the site Wilogo.
What it does: you fill a request for a logo there and several (hundreds) of designs will then design a logo for you. After one to four days you simply select the one you like and pay the price. Normal rates are about 800 EURO up to 1500 EURO (plus VAT).