I had asked for help finding suction cups for toy arrows. Hunted all over the Web, then my wife said, try the Family Dollar store, "they have lots of junk like that."
Toy dart gun set for $1.59 did the trick.
Here's the finished product with a couple dozen 1/4" white spruce shafts I made to supply the grandchild demand. The shafts came out perfect from my router jig. They are perfectly round, straight, smooth and right on .250" diameter
Makes me wish I was a kid again (of course I have had to try these out with the little 3# bow that launches them. They stick to windows quite well and thump the buttons in the couch with enough force to please a kid. (Don't think they would kill a mouse--probably would kill a fly or skeeter).