Personally i use fresh kill. Since you like the mom and pop shop why dont you still support them but kill the mice\rats at home yourself. I use a euthanasia tank that i made myself. All you have to get is a CO2 tank (paintball tank) attach a valve and hose to it ($20 i think of amazon). Then get an air tight tupperware container and cut a hole in it big enough for the hose to fit in on the lower side of the tub. Cut a small hole in the top for O2 to come out of and there you go essentially. Add rats\mice, allow co2 to trickle slowly into tub and leave them in for about 5 minutes to ensure death. There you go fresh kill. Or you can just break their necks (bit more practice cheaper).
Also since they were never frozen, if your bp doesn't take it you can always drop it into a ziplock and freeze to retry next feed day.