We have 4 laser pointers in the house, and because of the cats, their batteries are all out.
So I went looking around online. They all take AG13-type cells, and I found some website that claimed to sell 50 for $4, free shipping. I figured it could be a scam, but decided to go along with it.
They arrived yesterday. They work. Wow. Those people who want $6 for 2 can stuff it.