The largest sale of the year at Family Tree DNA, the Friends & Family Summer Sale, will continue through August 31. The sale cover almost all new and upgrade DNA testing kits. Of particular note is that this is the lowest price ever offered, $375, the the Y-chromosome full SNP sequence test called the BigY (note that this cannot be purchased as a new kit, but only as an upgrade option for men who have already taken a yDNA test).
In addition to yDNA and mtDNA tests, the popular autosomal test, Family Finder, is on sale for 30% off regular price. If you've been thinking of purchasing a new DNA test, this is an excellent time. See the Family Tree DNA Friends & Family Summer Sale for more information.