S9 on Bitmain went up in price.
Just for a comparison - The 14Ths S9s (not 13.5) just delivered for the October batch were $1141
(And they're underperforming the July and August 13.5THs units.)
Well all my 14.5's that were getting 14.5 are now all getting 13.5. Maybe the difficulty change has slowed them down?