My roommate has some old Canon equipment lying around. Wondering what they're worth. - Canon AE-1 body w/ 50mm f/1.8 lens - Canon 90-230mm f/4.5 lens - Canon 28mm f/2.8 lens - Canon 135mm f/2.8 lens They were originally sold at Sears if that means anything. He's looking to sell them, but we have no idea what they're worth. I'm all digital with modern lenses, so I'm not interested. Thanks!