I think I’ve posted about this before, but I love zenni.com.
I just bought a pair of prescription glasses plus a pair of prescription sunglasses (not shades, but full glasses) for a total of $36 including shipping. The pair of glasses I already have from these guys are holding up better than any others I’ve ever had. By a lot. Also, they’re the only glasses I’ve ever liked. (The new pairs are for Drew.)
If you wear prescription glasses, you should seriously think about ordering from these guys next time. If you already have a pair of glasses, it’s not that hard to figure out which ones will fit your face. The price/quality ratio is truly ridiculous.