The 64GB variant of the OnePlus 2 is now available for $349 in the U.S. (down from $399), £249 in the U.K (from £289), and €345 (down from €399) in Europe. Decreasing component costs means that OnePlus is able to pass on the savings to customers.
OnePlus mentioned that anyone who purchased the OnePlus 2 over the last fifteen days will receive a $50 rebate to reflect today's price cut. The vendor is also rolling out Valentine's Day offers, which include a free StyleSwap Cover or a OnePlus X case with the purchase of one of its devices.
Source: OnePlus forums