Crime epic Grand Theft Auto IV has arrived (as promised) on the Xbox Marketplace's Games on Demand lineup. The grand theft mega-hit costs $30 to download, which is the same price as a fresh new retail version -- a tiny bit more in some cases. We should probably note that a used copy from GameStop is about $25. By all means, if you have no way of getting to a retailer please feel free to buy the game online. Oh, wait, that was a missed opportunity for a "steal a car" joke, wasn't it?