There are several excellent people who do this, Arcellus Sykes is one of the best I have worked with. Check out his site for his work.
There are a lot of decent bass tabs already on the net, but you will have to use your ears to separate the good from the bad/ Try ultimate-guitar.com as well.
Sheet music direct has a pretty decent selection bass tabs at a couple of bucks each as well.
THis all depends on how obscure the stuff your playing is? Most of the Cure songs are on the net for instance. (and most are well done).
Last edited by obimark : 12-23-2012 at 06:32 AM.