I get bulletins from a place than handles close-outs and wholesale lots and about 4-5 months ago, I was offered these at a little less than $1 per piece (including shipping) in gross lots. I had no idea what the hell they were and didn't give it another thought.
Then, I see a story on the local news here in OKC about how they were so in demand that there were runs on stores who would announce they had them for sale and all inventory was depleted within an hour. BTW, they were selling for $5 - $7+ at that time.
This last weekend, I went to the Old Paris Flea Market in OKC looking for bargains and it seemed every vendor there was selling them for about $3.