I don't know all the places.
I do know that they can be picked up at any F&W office.
You can also email SRD and they will mail some to you. I don't know if mailing them is policy or just a courtisy, I could find no mention of it online or in the regs. But I emailed them and they assured me that they would mail me some tags. That was late last week, they should arrive around Wednesday.
Email SRD at
SRD.InfoCent@gov.ab.ca