Check out Graver , my personal favorite 
. He has a pretty long list, though, so you might have to wait a bit (or pay for a bump). There's also Images by Alex , Juggertha , Celtic Bolt , Lady Judgment , Shia , David Nakayama , Brandon McKinney , Gill Bates and TONS of others.
I'm in a chibi slump right now if you think he'd want one. Good luck finding the artist of your dreams!
I've enjoyed commishs from these nice folks:
http://syrusb.deviantart.com/ (humouous, easy to get along with, and awesome various art styles. Not as cheap as the others, but well worth it!)
http://funkyeti.deviantart.com/ Cheap and cartoon-like style made of WIN!
http://bokuman.deviantart.com/ Sexy women go here!
http://hugohugo.deviantart.com/ I HIGHLY RECOMMEND! The piece he did for me is one of my top 3 faves and didn't cost me much at all.
Awww thanks for the plug Star... 
I am a huge fan of all the artists mentioned and I recommend them all!
Hey everybody, I'm looking for somebody to do a piece of character art (sketch or otherwise) for a CoH Character. It's my roommate's birthday and I thought I'd do something cool for him like get him a nice drawing of one of his mains. If anybody can/knows a service that will provide this for me (and of course I will pay) then please let me know ASAP. An ingame email to Bolero, on the Justice server will suffice, or simply a response to this post. Thanks so much!
For the greater good,
Bolero