PBWM stands for "Price Before Warranty Minimum," and it is a way of making sure that the price of an item is fair for both the buyer and the seller. When you buy something, you usually want to make sure you aren't getting ripped off. To do this, you might check online to see what other people are paying for the same item. The PBWM is that lowest price that you can find. So, if you find something cheaper than the PBWM, you know it's a great deal and you should buy it!