Looking for TK-50 (and a few TK-70) tapes

I have both TK50 and TK70 media. All but 2 of the TK70 media were formerly TK50 media, bulk erased, then initialized in a TK70 drive. I have used at least 30 of these media as backup tapes with 256 MB of data files (8 * 32 MB each) and they still verify correctly after 5 years. Over 10 years ago, Memorex had a site with the physical and magnetic characteristics of most DLT tapes. The CompacTape (TK50) and the CompacTape II (TK70) were identical in all respects as far as I could understand, except for 2 items: (a) CompacTape II name was in blue and CompacTape name was brown (b) CompacTape II cost significantly more than CompacTape Just my experience with these media. By now, most of the media have been initialized as TK70, so a bulk erase would be required before they can be used again as TK50. As for availability, shipping might be high since I am in Toronto, Ontario. Also, US customs might want their cut. Let me know if you can't find some CompacTape in the US. Jerome Fine