Nvidia does not set the MSRP for custom cards, and in fact after the original supply agreements were over, I'm sure Nvidia changed the future agreements WRT pricing. So GPUs that have an MSRP of $1200 for the 3080 Ti FE, and "undefined" for the 3080 12GB, most likely cost the AIC companies more than the 3080 10GB. And Nvidia has a new SKU not tied into the original $699 3080 10GB, which means it can negotiate different prices.
Bottom line: Until the shortages and supply chain issues are well and truly over (and most likely not until 3-6 months after that time), only Nvidia is selling GPUs at its MSRPs for the Founders Edition cards, and then only in limited quantity. And stuff like the Best Buy restocks doesn't help anyone, since probably 80% of people in line (if not more) are just scalpers or their agents trying to get cards. I went to a BB restock event just for kicks, and even with casual questioning of people at the front of the line, it was extremely obvious that many of them had no interest in actually using the GPUs they were buying but were just going to put them up on eBay or wherever. And those who weren't planning to resell the cards were very likely planning to mine with them, since this was six months ago.