I'm 6'7" and have the same issues. I have turned to CL for my searches and have found a few of them in the past couple of years. "Tall" is my go to filter for CL and eBay. I have picked up a 67cm 1989 Bianchi Sport SX, a 27" Cannondale ST400, a 68cm 1983 Specialized Sequioa, and a few others along the way. Oh, and the search can become quite addictive.