Have not seen any in Edmonton, but I use Barnes CR-10 and it seems to work very well for copper removal.
I purchased some from P&D a while back.
I ordered and received Sweets by mail[probably not completely legal to ship by mail, but they kindly agreed to mail it] from Bashaw Sports in Alberta, near Edmonton. They have a website, but aren't here on Gunnutz.
check with wholesale sports or try CR10 as it has high ammonia content.
just remember don't leave either one in the barrel for more than 15 to 20 minutes if your barrel is chromoly (blued) as it will corrode and pit the barrel real quick.
any gun shop that sells cleaning stuff. Very common.
Does anybody know where to find Sweets 7.62 copper remover in Canada?