Poster Printing

I want to get 2 posters printed

Size: 24" x 36" (2ft x 3ft)

and I've been to ritz camera, and kinko's and they charge $40-60

does anyone know where to get it done cheaper?

Only place I know you could get it printed for cheaper is at deviantart. I don't remember how the print accounts works on there, but you can buy buy your own prints at the base cost, and for 24"x36" it's $27.
(http://shop.deviantart.com/help/337/)

I don't know about the quality though, they print only from JPEG images which means a loss in quality and definition.

I know plenty of places in the UK that print posters really cheap, and at amazing quality, but i'm not sure how quickly you need it.