Purple Sunglasses from Amazon.com
If you're looking for a thrifty option, look at these UNIONBAY Sunglasses. It's a wonderful product for a reasonable price. Another strong contender for your wardrobe is these Cole Haan Sunglasses. While the price of this item is not too high, it will surely attract a lot of attention.
If you're looking for something in between pricewise, why not consider these 7 For All Mankind Sunglasses. While the price is very reasonable, this piece is an easy wardrobe update.
If you have enough to afford it, then what you're looking for is these Tumi Sunglasses. It's more expensive but worth your money.