I don't know how it works in the US, but here I get fed up with this: "It's just as cheap to have new glasses", every time your prescription changes and all those "At the moment, we've got an offer on", when I'm quite happy with my frames, and new ones might not be as comfortable. And no I don't want a half price 2nd. set, I haven't got four eyes (despite the expression). The look of disappointment on the sales girls face when I came out this time with an unchanged prescription summed it up.