Which banks let you buy their bags of coins from the sorters? Cap1 and TD in my area say they don't sell them. Apologies if this has been asked 100 times - couldn't find a tread.
I would think a person would have more luck with a local bank. There is one in my area that has maybe 6-8 branches. They roll coins themselves to save fees. I have had good luck sorting through some of the bags they have especially at one branch. I have dealt with them enough that I just replace whatever coins I took from the bags and return them for more coins or cash. The vault teller even keeps up with which ones I have gone through.