not going to be sold
That's based on your personal opinion I suppose? Just double-checking on the subject because the price is right about "fair", here an updated list from one of my suppliers in China.
Used S17PRO 57T $4,850.00
Used S17+76T $5,761.00
Used S17 53T $4,269.00
Used M21s 54t $4,795.00
Used M21s 56t $4,960.00
Used M21s 58t $5,106.00
Used T19 84T, 7month guarantee $9,361.00
Used S19 90T $10,391.00
it is extremely unlikely to find cheaper prices than the list above, of course, there should a bit of variance between resellers based on the quality of the miners and the quantity,
I would most certainly not pay that much for such gear, but it's what it's, 10.5k for second-hand S19 is right about "fair" based on the current market conditions which are mainly driven by greed and newbies jumping into the game at the worst time ever IMO.