As others have mentioned, by far the cheapest, and BTW, highest quality and quickest turn around time is to DIY at home. Buy an $80 1 gal Arista E-6 kit from Freestyle Photo, also a $40 Paterson Super System 4 (suggest the 5 roll version) developing tank and 2-3 reels, go to Walmart and get a cheap $3 styrofoam cooler, a $10 digital cooking thermometer, a $4 digital stopwatch/timer and you are in business. With that investment, you can process 32 rolls. After that, each gallon arista kit will do 32 more rolls at a minimum. Some poeple go well over this and still get good results.
It is SUPER EASY, dont let anyone tell you color is too hard, start with BW, blah blah blah. That talk is what kept me from trying it for so long. Its only difficult if you dont have the patience to get the temp coming out of your tap just right - like 5 mins max of adjusting it.
Fast, FUN, great results, and minimal costs. Its the way to go, and you will save yourself a boatload.