I use tracks and untreated lumber (Games are not that heavy, don't need treated stuff), and it works fine and its pretty cost effective for the amount you can store with a long piece of wood that is 6 inches wide and 1 inch thick.
Something that is cost effective as well is a call back to the 60s, Cinder blocks and lumber. Just place a piece of wood on the ground, place cinderblocks at regular increments (it works well if you can get wood that fits in the groove of the cinder block), and repeat for every shelf you need.
Building a proper bookcase can also work well if you are interested in carpentry just a touch, and they are simple to build if you don't want to get fancy with adjustable shelves.