Because I am a shorty, this is my go-to place to nearly all of my pants hemmed up! They do a great job with jeans, and will even keep the original hem (which looks good with jeans) if you want. For getting pants hemmed a few inches they charge between $12 - $15.
I docked them a star because it takes a whole week just to get them back, which is too long to wait when I have new clothes I want to wear!