I have been using MSR canisters since they seem to have the best (at least here) isobutane/propane ratio.
I'm fairly new to canister stoves and never saw what the previous canisters looked like.
Last fall I found some isobutane/propane canisters marketed under the North 49 brand (World Famous Sales Canada).
I picked up a canister just to try out, since it was a bit cheaper than the MSR canisters can be had locally.
The shape is different than all of the current canisters from the big names available here (MSR, Optimus, Primus, Snow Peak, and Jetboil):

The cap is also different:

A few weeks ago I found some canisters at my local outdoors store being sold under the Martin brand (Martin is the name which Quebec based Bismar sell their various stoves products under).
These canisters also have the same shape as the North 49 canisters.
The canisters are made in Korea, and contain 227g of fuel; the same as MSR canisters.