The out of stock item was an issue for me in the beginning; then I happened on the solution. While walking around, checking out the store and looking for an inexpensive item to purchase(remember new requirements state not to buy snack items from the register area), you hunt for empty peg hooks or holes on the shelf.
As mentioned above: locations to find OOS's is kitchen or bath items, faucets, hand tools, etc. I tend not to use everyday items, why would you inquire about a product that could be bought at a general merchandise store for less money if they are out of it. (this would be a dead giveaway of an MS)
I one time chose an item that was OOS in one location only to have the associate walk me two aisles over where it was cross merchandised.
Shopping Southern Georgia, Valdosta, Waycross, Quitman, Thomasville and North Central Florida I-10 & I-75.