1. Wal-Mart Woven Squares are less than half the price of Nabisco Triscuits, and I believe taste better, as they have less salt.
2. Wal-Mart "Great Value" brand English Muffins are half the price of Thomas' English Muffins, are fresher, have 10 fewer calories, and no sugar.
3. The "Brick 'o Cheese" is perfect for morning egg sandwiches or for hamburgers or for lunch sandwiches and melts easily, and isn't a "processed cheese food" (whatever that is!) but rather real cheese. It is also very cheap.
1. Nabisco sent a cease-and-desist letter to Wal-Mart alleging some intellectual property rights infringement. Wal-Mart did just recently re-design the box for "Woven Squares" in a yellow format that looked a lot like the Triscuit box (ironically, Nabisco has made the "old school" original Triscuit box look more like a generic brand by using plain and small lettering on the packaging!). So it could have been a "trade dress" issue, perhaps. I doubt any Patents on Triscuits are still in force.
2. Nabisco pressured Wal-Mart to drop their house brand or to de-emphasize it. Given the volume of product Nabisco sells through Wal-Mart and the value of the Triscuit brand (which has the largest shelf space of any Nabisco cracker, or indeed any cracker in the cracker aisle!) they could have "struck a deal" with Wal-Mart to drop or de-emphasize the store-brand crackers.
3. Wal-Mart may have decided that they make more money selling $3.50 boxes of Nabisco crackers than they do selling $1.50 boxes of "Great Value" brand crackers, and decided to drop or de-emphasize their house brand.
4. Some combination of items 1-3.