It is DNA Day, and Family Tree DNA has started a sale that will run from today until midnight on April 29th.
This sale is for two products only: the Y-DNA 37 marker test for men, sale priced at $135.20 (plus postage); and individual SNPs at 20% off the regular price of $39 each.
SNP testing, for Y-DNA results, is used to expand your haplogrouping, which helps to understand your deeper ancestry.