I've got about 20 TK50 tapes that are available for no cost. The catch is
that they are in Sunnyvale CA and if you can't come pick them up then
you'll need to pay postage to your address. These tapes have been bulk
erased and can be used in either the TK50 (95MB) or the TK70 (295MB) tape
drive, the caveat is that if you initialize one on a TK50 drive, then the
TK70 will read it but not write it, if you initialize it on the TK70 drive
then the TK50 won't be able to read it. I refer you back to the archives to
refresh your memory that magnetically the specs for CompacTape I and
CompacTape II are identical.
--Chuck