MOTU discontinued the old programs years ago. I have Professional Composer 2.1, the date on it is 1987. eBay has been very dry lately, but don't give up on it. You just have to be patient sometimes when looking for this stuff.

I'd also check merchants such as B&R Computer and Herb's Mac Stuff, they often have a better selection than what you'd find on eBay at any given time despite having slightly higher prices (although they are worth it--I've bought a lot of vintage stuff from both and highly recommend them). Also, don't hesitate to put an ad in the classifieds here, someone may have one of the programs you're looking for.