Googling on "ambervue sunglasses" found 3,570 hits. There are plenty of on-line shops I can order from. But none that I've heard of. If anyone I know happened to look at those Google results and say "hey, I've bought stuff from site X that's selling them and they gave me good service", I'd be happier than just trying a place at random. If anyone can find a good quantity discount, I'd be happy to buy several pairs in the hopes of not having this problem again for a long time, and I'll owe you a beer.
In a related question, I had my eyes checked a few weeks ago, and they said that I actually could benefit a wee bit from corrective lenses. (I've never worn glasses, and I can function just fine without them.) It occurs to me that I might be able to kill two birds with one stone if I actually got corrective lenses that were also good sunglasses. And I've heard that there are places on-line where you can get good prescription glasses for much less than they'd cost at the local optician -- maybe even down to a price a paranoid cheapskate would be willing to pay. Any suggestions, or am I hoping for too much here?