Updated November 23, 2018.
FamilyTree DNA (FTDNA) has their Family Finder test at $39.00 and has reduced shipping. https://www.familytreedna.com. That’s the cheapest I have seen them offer it. On the plus side, if you order directly from FTDNA, you can do a free transfer to MyHeritageDNA and numerous other companies. The full free transfer ends before you will get your test processed by FTDNA, but you still get a limited free transfer that starts December 1, 2018 with an option to upgrade. It would be nice if they made a deal for those who order from FTDNA as both companies use the same test. Also, FTDNA processes the kits for MyHeritageDNA. Added to Third Round of November 2018 DNA Sales.
While AncestryDNA did a Buy 2, Get 1 Free Sale numerous times earlier this month which amounted to around $39.00/kit, you had to pay for two (2) kits to get the deal.