There's a song I've been dying to play, relatively simple, but I'm not good enough to figure out how to tab it. How can I get a song tabbed if I can't do it myself?
What you're talking about is a transcription service. However, these can be expensive, and the ones I found on a quick Google are geared towards musicians who want to put music or tabs on their own websites. Paying someone to make what's essentially sheet music of a song you don't own (I assume this is not music you own the rights to) brings up all sorts of copyright problems. You have a few options. My answer assumes you can't find tab for this song online:
Ask a friend how to play the song. Most communities of musicians have a few people who are very good at figuring out songs from the recordings.
Buy the sheet music; even if you don't read music, it'll have chords and lyrics and some even have guitar tabulature. This is your best option, and the most legal.
Learn how to figure out the music on your own. Except for the most complex music, learning how to do this isn't all that hard, but it is a skill that takes time to develop.
Ask the musician or composer. Many obscure or local musicians will be accessible in this way.