How to write the price increase instruction to inform the customer?

A model essay, please modify it as appropriate!

Dear customer:

Hello!

All staff of XXXX co., ltd sincerely thank you for your support and concern all the time, and hope to continue to cooperate with you in the future.

Since 2008, the prices of raw materials at home and abroad have skyrocketed. At first, in order not to affect customers' sales and purchase prices, our company repeatedly reduced its meager profit margin ... but so far, the impact of rising costs has made our company really unbearable.

After many considerations, our company decided to cancel the rebate sales method of our products from May 1 2008, and the price after restoring the original price is as follows:

Then attach the price list.

Then sign it.