FamilyTreeDNA's FamilyFinder test is down to $49, and the sale is active now! There are also sales on their Y and mtDNA tests. Affiliate link to their sale is here. And then you can look for coupon codes to bring the price down even further here. And they've temporarily dropped their shipping price (which includes your shipping the test back for processing) to $4.95! The sale goes through Monday evening.
AncestryDNA is down to $59! Affiliate link is here. This sale goes through Monday evening as well.
Note: I'm on Twitter. Follow me (@larasgenealogy).