It comes with one ring in box. I did find cheaper rings that are not name brand at Walmart for about a dollar cheaper. Each playtex ring is ~8$ CAD so it does add up. Costco has a great deal on them and they even out to about 6.50$ CAD.
I am honestly very impressed. I rescue animals for a living and many of them absolutely stink. I was worried that it wouldn’t work great because their poop is much smellier than humans but it realllly does keep it in. When I open the lid, it does smell though so it doesn’t actually lock it into the bag when the top compartment is open. If placing pee pads inside I was surprised at how little fit into it. When I read how many diapers I should be able to fit, pee pads should be about double the size of a diaper when rolled up.. I can maybe fit 5 pads inside.
Honestly, in terms of odor this is a total winner though. Nothing has compared and I’m purchasing two more for other rooms.