You could do this yourself with one of these (buy it at Radio Shack) and either Windows Sound Recorder (built-in to Windows Vista and 7) or Audacity (Google it). I’m sure Mac has some built in sound capture and editing software too.
This assumes you have a turntable with RCA outs.
If you want to try this, I can give you more complete instructions. The adapter shouldn’t cost more than $5, and the software is all free (or already included with your computer).