The Vintage Computer Festival has opened the Vintage Computer Marketplace, a web site for buying, selling, and trading vintage computers, peripherals, and software.With support for both fixed-price and auction transactions, keeping your inventory online for others to peruse, and much more, this looks like it may prove to be a great way to find that collectible joy you’ve been looking for — or to clear out a few precious square feet of closet space before your spouse leaves you.