Gambrinous is something we are running in our free time, so we were paying for all business setup costs out of our own pockets. Our budget didn't stretch to traditional design agencies, so we were forced to seek out an alternative route of getting design work done. We eventually decided to try a CrowdSourcing site called crowdSPRING.
The concept is quite simple. You post a project on the site with a brief and a set budget, and based on that information, designers will contribute designs which you can rate and provide feedback on. Ultimately, you pick one clear winner and they are awarded the full budget. It is possible to add second and third place prizes, but we decided against this.