You can buy the white Primeknit adidas NMD in the U.S. on July 15. Today, adidas finally announced the stateside release date for that shoe and the black City Sock.
Both of these pairs already released in Europe on May 28, but the Three Stripes kept quiet on a wider release till today. This pattern of letting NMD styles hit Europe first and arrive in the U.S. later is a typical one for these sneakers.
Based on the success of past Primeknit NMDs, these pairs will not be easy to purchase. As far as stockists go, look for Consortium accounts to have these on their shelves.