Wow! My Mom sent these to me for Valentine's day. Aww, thanks Mom! :)
She found them at a garage sale down in Florida where my parents hang out for the winter. The person selling them had marked them as vintage and didn't think they were made as rounds any more.
I did some searching and couldn't find any others, but I'm not sure that means they aren't made any longer. If you have any info on the subject, please leave a comment if you have a minute.