Another day, another Samsung Galaxy Note8 deal. This one is from eBay (US-based seller) and asks $725 for the stylus-packing flagship. It's the dual-SIM Exynos version of the phone, which should work in most places in the US. Note that AT&T's Band 30 and T-Mobile's Band 71 are not supported (those have already rolled out to some of the larger US cities). And you're not getting warranty. You can check out the deal here, but note that it may not last long. Only a limited quantity is left and only in Black. Or have another look at yesterday's deal.
Source: https://www.gsmarena.com/deal_samsung_galaxy_note8_on_ebay_for_usd_725-news-29203.php