I thought DATs were taxed? Maybe not, but they're damn expensive!
What kind of music are you into? I live in Vancouver as well!
It took me about a month to find a place that sells reasonably priced DDS tapes here in Vancouver (well, they're in burnaby actually, but worth the 20min drive).
www.PrecisionSound.comThey're currently out of stock of 60m/90m, but they'll order you tapes (I just placed an order yesterday for a 10pk of both 60/90) and they're Maxell Hs-4's.
They charge:
Maxell HS-4/60 S 4mm Backup Tape
singles - $4.00ea
10pcs - $3.50ea
Maxell HS-4/90 S 4mm Backup Tape
singles - $4.55ea
10pcs - $3.95ea