Where can I buy Magnifying Glass?

I’m trying to find a store in my area that I can buy a 5x to 10x handheld magnifying glass. I need it for work. I do detail machining on aircraft parts. It strains my eyes when I don’t have one. I have a Loupe, which is an eyepiece, that magnifies 10x but sometimes I can’t get close enough to what I’m trying to see to even try to use it. I couldn’t find one online at Walmart and don’t want to waste my time and gas going in there for no reason. Help Please!