I just found clear blue digital OPKs on clearance at my Walmart. It looks as though they are going from a 7 stick pack to a 10 stick pack, so the 7 stick packs were on sale for $13 (instead of $25!). I just happened to see it sitting on the end of the shelf with the other OPKs. Don't know if anyone else's Walmart or Target or whatever is doing the same thing, but you might want to take a peek!