Do you have a Costco membership? You can order regular sunglasses online or in store at their optical department. I recently went with them for 2 pairs of prescription, 1 regular glasses with transition and 1 pair of prescription sunglasses. Total before insurance reimbursement was less than $300. You should be able to get a nice high end, high quality pair of non prescription sunglasses for less than $200 and they stand behind their products way more than other merchants.

Be aware that their online store is extremely lacking and it's probably better to go in store unless something online works for you.

I preach the holy site that is Costco to anyone who will listen. $60/year can save you hundreds from optical and pharmacy alone.