I got a bunch @ 99-cents each at K-Mart about 6 months ago, but they didn't have any of them last time I went in, and no trace that they were going to re-stock (no price tag or empty hanger bar) In town we have a K-Mart, an Albertson's and a Rite-Aid. Wal-Mart is about 40 miles from here in Bakersfield. I'll check next time we go over there.
I actually found a website that sells them for 99-cents ( http://www.petguys.com
), but when I went to check out (I was going to buy 20) they were going to charge me $9 for S&H *lol*
I have a few already, but my litter box takes 2, and with my sister getting a kitten in a few weeks I want to make sure I am stocked up on them since we have another covered box which uses one.