Magnifying goggles

I had cataract surgery some years ago and have to wear reading glasses for up close. My vision beyond 6 ft is 20/20. I do not need Rx glasses, only magnifiers. So I need a pair of goggles to read my swim watch. I get to the end of a set and see the lap count but have great difficulty reading the time. Reading glasses cost only about $10 vs hundreds for Rx glasses. Where do I get "reading" goggles?