Anarchy Eyewear Boomerang Sunglasses $10/$7 with 30% off coupon at FootLocker.com
FootLocker.com has the Anarchy Eyewear Boomerang Sunglasses with 100% UVA/UVB/UVC protection for $10 + shipping. Also available is the Anarchy Eyewear Supreme 2 for $10 + shipping. Shipping is $7 for one item, $2 for each additional item. Search for anarchy eyewear.
If you wait till the sale starts (another thread which has 30% off coupon), this will become $7!!!!!
One of them is this. If you search, you will find several models.
I have those! They are great. Very light, but tough.