I've seen them at BB&B, and imo, there a little to expensive, to use personally...
I prefer the "Glad Force Flex" bags from Sams Club. I just manually pull the bag through the hole in the Plastic thingie, and it grips around the can just like the more expensive SH bags.
I bought a box of trash bags for $9, last year, and I'm still trying to get through half the box 😛