I've had good experiences getting C-41 film developed inexpensively by the MPIX company:: Film Developing : Help : Mpix
They really want to sell you photo based products, not just develop your film, but they will send you postage-paid mailers, develop your film at a cost of 19 cents an image, and scan your film at 6MP resolution. The scanned images can then be downloaded from their site, and your negatives will be returned to you at no extra charge.