More specifically, how to get us to stock a game you would like us to carry.
For a new game, the best way to ensure we stock it in is to pre-order it. It amazing me how few pre-orders we get for games, so we're left ordering blind when we look at the list of 200 new games jockeying for shelf space each month. Since we're investing money in each of these games we stock, we're going to err on the side of caution when putting in our orders. That means a lot of very worthy games get bypassed since we have no idea whether anyone will purchase it or not.
For example, we will pass on Cipher Studio's Hell Dorado line of miniatures because, while they look very cool, I have had exactly no-body ask if we were carrying them or shown any interest in them.