Walmart, Kmart, Target, Sam's, Costco, and most other big stores have products with different numbers that are unique to their stores because you know those price matching ads. If a company is big enough to buy several thousand or a million big ticket items, Pioneer or any other company will gladly put a special model number on them. There are even different models used by Sam's than Walmart. when I was looking at TVs I compared closely because Walmart had a sale but extended warranty cost more making it higher. I usually don't buy those, but TVs have a higher rate of failure.