I would suggest trying a few online download stores such as iTunes, Napster, etc. as most of these charge just 99c per track if any have it. If you need to play it on an MP3 player which doesn't have compatible DRM with the store, a workaround would be to burn the track to CD and then use any Audio CD ripping application to extract and convert it to an MP3.

However it is against our forum rules to discuss about the unofficial downloading of copyrighted works.