BIG FINISH, the production company that makes the past-Doctors audio episodes...and who pretty much make up the complete era of Paul McGann's 8th Doctor...are beginning to offer their stories as downloads. They start around $8 dollars. Pretty damn cheap, considering you're getting a full multi-hour episode. Also considering that, after you pay overseas shipping for the physical disc copies, they would normally run you between $20-$40.

Doctor's 5 - 8 all have entire "seasons" of Big Finish stories. I think only about ten are available for download so far, as they're just starting out. Still, looks like it might be a good deal. I'll tell you after I download one...