I passive-aggressively commandeered my parents' old Panasonic/Kenmore canister vacuum when they had a central vac installed in their home. I have yet to succumb to the Dysan cult and need vacuum bags, and this was the easiest way to get them and the best value.
If you're holding onto the past like me and have an old Kenmore/Panasonic canister vac you still use, this is the best value for your money in replacement bags for it.