Hi Afa,
Welcome to the Mattress Forum! … and I’m glad you found us!
Unfortunately your experiences with “negotiating” is fairly typical in the mainstream industry. The worst part is you were probably negotiating for a mattress that wasn’t “worth” buying for $2099 either and that you would most likely be best avoiding in the first place (at any price) because it would likely have lower quality materials that would be a weak link and would compromise the durability and useful life of the mattress anyway.
Better manufacturers and retailers don’t generally “negotiate” (see post #6 here) or have “fake sales” with large discounts based on the time of year or holidays (see the guidelines here and post #5 here). While they may have sales with smaller discounts … I would treat retailers or manufacturers that negotiate their prices or have “major holiday sales” with “huge” discounts as a red flag because manufacturers or retailers that sell good quality/value mattresses don’t need to negotiate or have “fake sales” with misleading discounts to create a false sense of urgency and they sell good quality/value mattresses every day of the year at prices that are already very reasonable.
The good news is that you ended up making a great quality/value choice … and congratulations on your new mattress 
I’m looking forward to your comments and feedback once you’ve received it and have had the chance to sleep on it for a bit.
Phoenix