I've gotten my travel vaccinations at the downtown clinic for my last three trips and have been pleased with the service every time. They always manage to get me in quicker than other clinics (ie. my doctor's office, the UW travel clinic), and the prices are reasonable. They office is pretty easy to find and I've never had a hard time finding street parkings so it's not inconvenient even though it's downtown.
They offer the widest range of vaccines and you have two options when you make an appointment. You can pay $70 for a full consultation where the nurse researches where you are going and tells you a little about what precautions you need to take, or you can pay $50 for a more general appointment where you don't get the full talk, but can still ask questions and for their suggestions.
The clinic also sells DEET mosquito products at a reduced rate - 6 for the spray and 7 for the lotion -- if you don't have a problem with DEET then it's cheaper to buy this here than wait and got to a sporting goods store for the product.
more