A few weeks ago, it was discovered that there were two more LEGO San Diego Comic Con 2020 exclusives, one of which is the LEGO Star Wars Nebulon-B Frigate (77904). Thanks to Jeremy at The Holo-Brick Archives, we now know where the set will be sold at.
According to a now deleted product page on the LEGO Star Wars Amazon Store, the set will be sold at the online retail giant. The set will retail for $39.99 like with the other SDCC 2020 exclusives but there’s no word on when it will be available for pre-order/purchase. I’m going to assume that the Nebulon-B Frigate will eventually be on the LEGO Shop as well at some point so stay tuned for that.