I just ordered a set of three cheaters for dh from http://www.goldviolin.com I'd get things from them for my Mom before she died. I still get their catalog (since I'm sure over the years dh will need more and more help) and they have some pretty handy things for folks with limited capabilities. The glasses in their catalog are special because of the higher magnification levels. I saw them going up to 6.0. I got dh a set of three for $20.00 plus $7.99 shipping. Not Dollar Tree cheap but not expensive either for three. I'm thinking it's hard to find much over 3.5 or 4.0 most places. Oh, if you want to find them the item number is 93329. I couldn't find them when I searched for "glasses" - weird.
(We just had a Dollar Tree open 1/2 hour from here where I do my grocery shopping. Haven't been. They opened yesterday and I was nearby Thursday. Across the hwy a Goodwill store is opening next month. Whew! We're going big time.)