For members only, Costco is offering it's 55"OLED55B7 model for only $1,399 which includes 3 years extra Square Trade warranty (bringing the total warranty coverage to 5 years) and 6 Months of Sling Orange (their $20/month tier) w/ HBO. Valid online and in store through 6/2/18. You may need to log in with your Costco account to see sale price.
While I've seen some other sales (like Massdrop) or random Ebay sellers selling this TV for slightly less, this is the best price I've seen for a reputable store with an excellent return policy. Costco offers their Concierge service which will help you through any issues you may have, including tech support and guiding you to the right place for returns/warranty service/repairs if needed.