I concur with Roxi331; the saying "you get what you pay for" definitely applies to commercial photofinishing. Near me, drug store 1-hour labs charge about $8.00 for 4x6-inch prints from a 24-exposure roll. These outfits produce inferior results to ABC or PhotoWorks, in my experience. I'm sure I could find someplace that'd do it for less than $8.00, but I'd be skeptical of the quality. You can go up in quality from ABC or PhotoWorks, but as I mentioned, the price will go still higher.
If you want quality
and low price, my only suggestion is to do it yourself. Freestyle (to pick a vendor at random) sells
a C-41 kit for $25.99 that's supposed to do 6-8 36-exposure rolls. That works out to $3.25-$4.33 per roll. If you then scan your prints and get digital prints made for $0.19 each for half the shots on each roll (I'd seldom want to keep more than 50% of my shots, hence my "half the shots" assumption), that works out to about $6.67-$7.75 per 36-exposure roll, or a buck or two less for a 24-exposure roll. The downside is that you'll put a lot of labor into saving a fairly small amount of money. The upside is that you'll have more control over the process, the results will be better, and you'll be less likely to get scratched or otherwise damaged negatives (assuming you're competent in the darkroom). If you've got a full darkroom with an enlarger, you can make your own prints, too. The cost will be comparable to that of getting digital prints made at a minilab, but the effort involved in making them will be much greater. Personally, I don't think it's worth the bother for 4x6-inch color prints, but I might think differently if I were more proficient at color printing.