I have used Photoworks (
http://photoworkssf.com/) for most of my developing. It's close to my house and they do a nice job in developing. They also offer a 10% student discount. I recently got their hi-resolution scans for one film, and they were very good (they use a Noritsu scanner in case you wonder). However the colors of the scans were a bit off here and there; color-wise my home scanner (canoscan FS4000US) did a better job, but the noise of their scans was much lower than mine. For walk-ins they charge $20 per hi-res scan (all prices are online btw.).
I have tried a few mail-order places:
Coopersimaging--terrible scans, developing was OK. Developing only for C41 was $6 per roll, return shipping $1.99.
Bison Photo--scans were OK, prints and developing was good. $4.99 for developing only, don't remember what the shipping was, maybe free?
Dwayne's Photo--scans were really good for the price ($2.99). Developing and print also. At $3.99 a roll I think it's quite a good deal, and I will probably use them again for larger quantities.
Wolf Camera--absolutely useless scans (calling it "hi-res" is a joke), developing was very bad as well. It could not have been the camera or the film, I used both before and had way better results. Others here have mentioned that it really depends on the operator, and that good results are quite possible, however I don't want to take the chance, I will never go there again.
I will keep using my local lab for now. I just don't want to have any of those cheap labs ruin my film again, I rather spend the extra $2 at the local lab. For larger quantities I will probably use Dwayne's again, getting a quite acceptable scan for $2.99 can't be beat, here is a link to one of their scans, untouched in original size:
http://tebert.com/dump/9167412001NEG0013.JPG
By the way, mailing in a film shouldn't cost more than $2. For some reason you cannot get this price when trying to print a shipping label via USPS online though (at least I couldn't figure it out). This is a drawback for me, since my post office is not exactly close by.