From the major retailers, Visions is having a bit of a sale right now. I got my dad a Q9G. As far as 80+ inch sets for around $3000, I think this looks to be your best bet.
https://www.visions.ca/product-detai...sku=XBR85X900H
On the much less expensive side of things, this one with the bonus 2 year warranty is a heck of a deal.
https://www.visions.ca/product-detai...d=0&sku=85H78G
On the other hand, it's 77 inches, so not quite 80, but for the price, hard to do better than this...
https://www.tvoutlet.ca/collections/...nq-oled77cxaua
TVOutlet has a bunch of really good deals most of the time. They seem to have decent reviews, but it is a bit of a risk buying from an outlet.