Unfortunatly, you can't easily get any of that media here in Canada without paying a MAJOR premium! Heck, I work for one of Canada's biggest Maxell distributors and I still get dinged pretty bad if I want to buy Maxell DVDs! The only cheap maxell DVDs are the illegal ones with the pirated ID code!
The only Ricoh discs I've seen are the DVD+Rs, and those are really made by Ritek I believe anyways.
I haven't seen any T.Y. discs, unless they are still under the fuji name, in which case they are MASSIVELY over priced as well

and VERY difficult to find too!
MCC is easier to find under Verbatim Datalife Plus, but again, the price is crazy compared to Ritek.
It's pretty sad, but I can buy 2 or 3 pieces of Ritek media for the same price as 1 of any of the above mentioned DVDs!
Punch Cards -> Paper Tape -> Tape Drive -> 8" Floppy Diskette -> 5 1/4" Floppy Diskette -> 3 1/2" "Flippy" Diskette -> CD-R -> DVD±R -> BD-R
The Progression of Computer Media