Steiner Sports Collectibles will begin its sale of Giants Stadium memorabilia with a preview of seats tomorrow as well as items made from game-used turf, goal posts and yard-markers. Prices range from $29.99 for a game-used turf plaque up to $499.99 for two seats from the 34-year-old building that hosted the most National Football League games in history. Starting next season, the teams will share a $1.6 billion stadium under construction next to the old facility in East Rutherford, New jersey.