Hey FreeFree, if I come across dupplicates of something I already have, especially the SA 90's newer stock models, then I will pick them up at a reasonable price and re-sell them. Only to support my quest to aquire more of the harder to find and more expensive models. Those MA-R90's and MA-XG90's don't come cheap unfortunately. But once in a while I will get lucky, last month I scored a sealed MA-R90 on eBay for $18!!
Shame to admit I don't much record on cassettes anymore, I would like to but I don't have the time. But I do have a lot of recorded cassettes - that I recorded or I picked them up recorded. I have to say that a good recorded cassette done on an old stock SA90 sounds just as nice as the day it was recorded.