Dear

Due to the increase in raw material costs, we must
unfortunately raise the cost of our merchandise to you.

We have avoided raising our prices for as long as
possible, but we can no longer prolong the inevitable.
We have enclosed our new price list for your review which
goes into effect on [date] Any orders placed between
now and [date of increase] will be honored at the lower
prices.

We wish to thank you for your valued account and know that
you will understand the necessity for this price increase.