They are not stopping the production of cotton batting. But the price of both cotton and poly are going up because the raw materials (cotton and petroleum) are going up. I loaded up on cotton batting before the price changes, didn't even think about the poly. So far, I've only had to pass on a $.25 increase per yard in the poly. There hasn't been a change in the prices of the wool batting, yet.
Part of the increases to expect are also the increases in shipping, which are built into the prices of everything you buy.