The money you think you might save by buying used shoes could very well be lost in pain, anguish and doctor visits because your back and pelvis are thrown out of whack wearing shoes broken in and conformed to someone else’s walk, gait and body structure.
Spend the little extra now; it will save you in the long run.
I have found some great buys on “gently used” shoes on eBay. Many dudes buy very nice shoes(or have them given as gifts) wear them a couple times, then sell them.
I treat them with some anti-fungal and anti-bacterial powder and find them a great bargain.
Note that I am talking “gently used”, those that aren’t “broken in”.