Luis's tapes are excellent. There soon will be tapes available made in the US. Dolby level, W/F and azimuth. The announcement will be on NakTalk, and I'll probably forward to tapeheads. Test tapes are more involved than one might imagine.
I know the Sony W/F tape is still available, and their azimuth tape may also be, but a set will cost more than LP's tapes.
Skewing at 5kHz needs to be corrected before trying to align your deck.