It is a pain but it is DIY. There is a rebuild shop in NY that will repair the bad regulator. It is mentioned in this thread.
Right Rear quarter window regulator, convertible - Rennlist Discussion Forums
"Hi, just search on Google.....the company is called regulatorusa.com.....I was scared to send my regulator to them but I thought it was broken anyway so why not....The next day that they got my package, they shipped it back to me.... once I got it back, had it installed and I have a working window....I know the price of the new regulator 600.00+... but this cost me 150.00 + 20 dollars to ship. Not a bad deal."