I don't think you actually need those 'tapes with memory'. If my memory serves me correct all they do is record what built-in transitions you use on the camera, to avoid actually recording the transition over the original footage.
The tape itself stores the time code as meta-data on the footage. you just need the software to extract it.
I've recently imported some footage from several years ago (2002), and My S/W automatically filed it under the correct date for me. No clever tapes, just standard mini DV, and software that can handle date tags.
If you do still want them, stores like Jessops usually have them in stock, but they're about three times the price
http://www.jessops.com/Store/s16867/...y=False&comp=n