We just sold a vintage (1980s) building toy set for $446. Paid $17, sold first go around in a five-day auction. This is a profitable category of toys. For a little while, I've opened up for public viewing the "Building Toys" page of The Thrifter's Field Guide. The toy that just sold is not listed on this page yet, however, you might find a few things on this page you would normally overlook. Enjoy!