Hey Lex3486, You can try your luck on eBay bidding for one. I have received one quote of 350.00 for the Receiver and
CD Changer. But you would have to purchase the magazine that holds the CDs from another source. It is easy to install.
I have found the installation instructions on eHow. Here's the number of the guy selling the Receiver and CD Changer
(800) 222-2528, ask for Kevin.
I am currently selling my 94 ES300 and going for the 98 model.
Always happy to help another Lexus Owner.