Rich I've been using them for the last couple years. A freind gave them to me, he got them at a dollar store or somewhere like that.you can get them online.
Russ d
If you just need glasses for reading,I used the stick on reading bifocal on my sunglasses last year. They worked ok for the $. They were somthing like this. http://www.eabco.com/BifocalStickOn.htm
RussD