This is the only thing I see that may be relevant to what you described.
How does the Best Buy Black Friday Price Guarantee work?
If you are a My Best Buy® member and you purchase a qualifying item (those identified 10/13/20–10/28/20 with a “Black Friday Price Guaranteed” message on them on BestBuy.com) and the price of the qualifying item goes lower than your purchase price prior to November 28, 2020, we will refund you for the difference between your purchase price and the lower price. Price applies to new items and excludes coupon, bundle, free-with-purchase offers and pricing errors. Best Buy plans reimbursement of the price difference in the following ways: Credit card purchases will be reimbursed on the credit card used at time of purchase; purchases with a Best Buy Gift Card will be reimbursed on the purchasing gift card; purchases with My Best Buy certificates will be reimbursed as My Best Buy points; and cash purchases will be reimbursed via a check mailed to the address on record for the My Best Buy account. Best Buy reserves the right to send a gift card or e-gift card as a method of reimbursement for the difference. Reimbursements will take place by December 14, 2020. See
Black Friday 2020 for details.
I’d talk to customer service when the Costco deal goes live.
Worst come to worst, if you don’t get a price match adjustment, you can always take it back and re buy for cheaper : yeshrug: