FTDNA is having a sale on its DNA tests till July 15, 2012.
Their autosomal test, Family Finder, which can be submitted to Harappa Ancestry Project, is on sale for $199 instead of a regular price of $289.
In addition, their mtDNA and Y-DNA products are also discounted till end of day July 15.
Zack, A paper that you may use. http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0041252;jsessionid=49A7AEE306635A328C7FAE5337A900B0