Do you have a carrier version or is it unlocked? Is it the 10 or 10+, and what storage config do you have? Your best bet would be to head over to Swappa and see what preowned are going for there. As @mustang7757 you could add another $175 or so for the extras depending on condition and assuming a buyer would be interested in all 3.
With Black Friday and Cyber Monday now and then Xmas sales starting straight after, I think you need to be prepared to take a big hit on the wallet unfortunately.
You could probably keep and enjoy the lot until February and then sell and get same price as you would now