Two summers ago, I did a clean and rebuild on my roto-tiller carb. Initially bought the parts from a local small engine shop in Lethbridge. Had a very rude parts counter experience from the owner. Paid my $25.00 for the various gaskets and went on my way.
Drove past a NAPA auto parts store, stopped in there on a whim. Bought all of the same parts for less than ten bucks! Promptly returned the other ones . . .
Won't use the small engine place again, found out that NAPA carries more than just automotive parts.
Give them a try, you might be surprised.