A couple years ago, during post Christmas Walmart clearance shopping, I had made a few medium sized purchases. From experience, I expected to trigger my card's fraud prevention, so I actually called them before my next purchase, explained the situation, and requested my fraud detection be turned off or whatever flag they could turn on my account. Customer service said they understood, no problem, etc - Get to the next store, make a $600 purchase, and of course, card declined. So maddening.
On a side note, I love you guys casually talking about ordering a couple thousand sets off Walmart. I am not sure if you're just big time flippers or there's something obvious I am not seeing, but I have no idea what stuff is being bought at this time of year for 15-20% off en masse, not sure if I should be scared or not.