>I am interested in getting a tape drive for my IIgs.
If you can find one, the Apple Tape Drive will work. It is 40 MB, slow, and discontinued. Else, TMS sells 150 MB Teac tape drives. They had a 60 MB model, but I don't think they sell it any longer. I'm pretty sure Archiver won't work with the Teac drives. You should buy Tim Grams's GSTape. The RamFAST will work out of the box with the Teac (and Apple, I think) drives with the included software.