Best to call kios to check on direct delivery inventory. One pool for entire usa, no back order no raincheck. They have been known to run out of stock often for iphones and samsung last month.
Goto costco kios and ask for "direct delivery or direct mail". They will snail mail equipment to you, and works with EIP (ie monthly payment & bill credit). Paperwork will have such indication and rebate info, and they will feed this info to your t-mobile account behind the scene. You'll get $200 costco cash card for each phone.