Janitorial supply places, restaurant supply places, uniform supply places, online stores, hardware stores, Sam's Club, they're really not hard to find. If you're looking specifically for drawstring bags, you're pretty much limited to brand-name ones like Glad and Hefty which cost more and in my opinion aren't any better then the plain Sam's brand. I keep a box on hand for emergency use, like recently when someone backed up to our dumpster and filled it right after it was emptied (The driver won't relock it like he's supposed to). I had to bag most the trash for a week, piled as much as I could on top of the dumpster and threw in the rest after the next scheduled dump, and despite a lot of heavy and sharp stuff never had a bag break. I just grab two sides of the bag and tie them together in a knot, no wire ties or drawstring, really not a big deal.