Figured this was a pretty nice deal on one of the higher end LG 4K OLEDs from their Signature series... I was at Best Buy yesterday and the manager told me that they just took down their previous year's display within the past couple days to put up the new 2018 models. So yes, this is a floor model but at substantial savings (and if you're really concerned, you can always buy protection). He even knocked another $80 off for me, plus I used a bunch of reward certificates (which is why the price looks weird on the receipt).
From what he told me, this should be available at other Best Buy locations (though each store probably only has one) since pricing came down from corporate. Mine was marked as missing some things though it was actually complete with cables and remotes.