If Art.sy is borrowing from Pandora’s business model, Artspace is taking a page from the Gilt Groupe and other fashion sites that hold flash sales. Prices start at $100 for a photographic print, and winning bids average between $1,000 and $3,000. High-end prints by artists like John Chamberlain, Sol LeWitt and Chris Ofili are among its mainstays. In April, a 16-edition set of photographic prints by Chuck Close promptly sold out for $2,700 each. Founded in 2011, Artspace now has 70,000 members and times its flash sales to coincide with major exhibits and art fairs—perfect for art lovers who aren’t wealthy enough to be jetsetters.