T02 is +R media and G02 is -R media. Both of them are 8X media. The 12X +R TY is T03 and I expect that the 16X is T04. You are right, the 16X should cost more. Put a link here for the store you are looking at and maybe we can see what is going on. $80 per 100 is quite high, at least for the USA.
Never mind. I think you mean Blankmedia.ca. They are not quite fair when they rate the media. They are selling 8X media and saying that it will burn at higher speeds. They actually link to the 8X media when you search for 16X. While it is true that you can burn 8X at higher speeds, it should not be priced as 16X.
Try some US companies and see if they will sell to Canada. Supermediastore.com
Also Verbatim is a good media as well if you cannot get TY. They run rebates all the time.