Until Dec 31st, Allergy Guardian http://www.allergyguardian.com
has 25% off almost all products on their site, including Comphy bedding using the code listed on their homepage, AGIFT4U, during checkout. They also have another code sent out to their newsletter subscribers, GIFT25, that you can use if AGIFT4U stops working. You can only use one code per purchase.
Typically, Comphy bedding ships for free but for some reason Allergy Guardian charges shipping but it is reasonable. The shipping was only $2.99 for my order.
If you look on the internet for the best bedding, most people say the Comphy microfiber sheets are the best there is. They are commercial grade sheets and they are very soft but not slippery like silk or other soft materials. Their products aren't sold in any major stores and pretty much everyone that sells them charges full retail price so it's rare to find a discount on them.
I've been looking for a good deal on Comphy sheets for a long time and this is the best deal I've seen.