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you're only gonna get fakes for that price.
Go to ebay. Go to the women's sunglass section. Look for unisex glasses like raybans or prada etc. Bid on base price. Usually women don't frequent ebay so there are fewer bidders. Many men don't check the women's section glasses. This is how I got my Rayban cockpit for $60 (almost new. New pair costs $135). Be careful about all them fake sellers though. I'd recommend getting a preowned pair.