Building My Own Sunglasses With Used Parts

[coffeetime]

Hi all I'm trying to build my own sunglasses with different used parts found across the Internet like from eBay and other places like that. Planning on getting just the frames, matching it with lenses that will fit and then get the needed screws and nose pads to make it all work. Any suggestions on the best place to look for some of these parts to build the sunglasses myself?