The Wal-Mart in Pittston, PA just off of Interstate 81 has 4 TIE Bombers in stock as of last night. They were up on the top shelf though so you'll have to look up for them.
Because they're resetting their shelves, all the Star Wars merchandise is split up. The Bombers are with the action figures near the bikes. It's the aisle on the other side of the board games.
It's retailing for $28.64. Hope this helps somebody!