Micro Center 20% off Clearance YMMV

YMMV went to Micro Center in Patterson NJ this Saturday and looked at an XPS 15 laptop. I asked about any open boxes and they had one that 15% off the regular price. I asked to take a look at it and found it was in great condition. I said I’ll take it and the guy wrote 20% off for me on the receipt. I asked what it was about, and he said they’re running a special for all clearance items. In the end this saved me $ 600+ on a full price $ 2000 laptop. I asked how long the deal lasts and he says he doesn’t know.