LEGO PC Games Available on the Cheap from Amazon
Actually, I have no idea how cheap a "bag of bricks" are, but if it costs more than $10, than these LEGO games are definitely cheaper. Amazon has LEGO Batman, LEGO Batman 2: DC Super Heroes, LEGO Harry Potter: Years 5-7 and LEGO Harry Potter: Years 1-4 all available for digital download for super cheap prices.