Still coming back here. I find their prices fairly reasonable considering that I do not know how to sew or repair anything.
To remove pockets in pants, it's about $25 - $35
To hem pants about $25.
To do slightly more custom work about $50 (e.g. adding length to sleeves or adjusting things)
To add straps about $25.
These are all reasonable prices to me. They're not dirt cheap at $10 - $15 but I can see that these ladies have been working there for a long time and a lot of rich folk seem to waltz in with very nice designer things (and wedding gowns!) to get them tailored.