As a matter of fact, folding reading glasses are not very different from the other kinds of glasses. Their biggest feature is the ability to be folded which could bring the user some convenience and less likelihood of breakage. Since Walmart is a supermarket, you can get what you want at a nice price, generally speaking not very pricey. It would cost you about 50 to 100 dollars. However, the quality should not be neglected.
There are the folding Reading glasses at Walmart. Based on the materials of the frames and the lenses, the price of each folding reading glasses is different, ranging between $20 and $60 in average. You could go to their online store and have a look. Then you can base on your needs and favors to choose one type that suits you.