"Cheap" Color Copies FAST?

so i have an event next friday, and upon getting the 4''x6'' mini fliers from the club when what i thought i was getting was full size 8.5''x14'', i need to print up some of these big ones to post up. if you guys have any recommendations on where to go for the cheapest one-sided color copies, i'd greatly appreciate the sharing of knowledge here :D

in b4 the public library

thanks guys

We usually do Kinkos for the rush jobs, but then we are usually doing b&w. The events we do color for we usually are so far planned ahead that we get from a printer we have account with. If you are wanting less than 50 though I am sure Kinkos would be fine.