If you need a DNA test it, I encourage you to look at the Family Tree sale. Their Family Finder test (autosomal test) is on sale for $79 - same price as the Ancestry sale. The major advantage I have found is in testing elderly relatives, who sometimes have difficulty producing enough saliva for the Ancestry DNA test. The Family Finder test uses cheek swabs instead.
Also, Family Tree offers the Y-DNA test kits (for your father's line) and the mtDNA kits (for your mother's line) - also on sale. These tests are not sold by Ancestry.
As an added bonus, WikiTree gets a referral bonus (at no cost to you!) if you use this link to access the sale page: