Both Family Tree DNA ($89) and AncestryDNA ($79) have Christmas sales for their DNA kits (those prices do not include shipping). I think the Ancestry.com DNA testing sale will last only until November 20th. Family Tree DNA‘s sale is on until the end of the year. In contrast 23andme just doubled their price but is adding new interfaces and health results.
Family Tree DNA has special gift coupons for existing customers; so log in every week and see what you have. Roberta Estes suggested that people could put their unwanted codes in the comments on her detailed post about the ftDNA sale. That seems like a good idea to me. You can do that here too, but please indicate in a reply to each coupon comment when you have taken that one. I will list a few of my coupon codes also.
I have written up my recommendations for where to do your DNA testing on my comparison page. Here is a summary of my current thoughts on which company to use.