Lost my clip-on sunglasses

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A couple weeks ago I left my clip-on sunglasses in a shopping cart at Walmart. My son had been playing in my purse, and I saw them in the cart when I took the kids out, and realized when I got home I didn't have them. I should have gone back or called, but with the number of carts they have what are the chances someone would have seen them? Anyway - yesterday I did some looking for a replacement clip-on. I can get a new frame and clip for around $90 with blank lenses in them. The replacement clip is $60. For that price I might as well get a whole new frame and keep it just incase I break mine - and considering how often mine get sat on (while on my head no less) I'm surprised they haven't broken yet. It really bums me out because I really liked these - the clip-on is magnetic and is made to fit my frames, so that when it is on there you can't even tell there are 2 pieces. What would you do?