Costco S9 and S9+ T-Mobile BOGO $679 or $800.

Costco has a BOGO promotion on T-Mobile woth the S9 for $679 and S9+ for $799.
Rebate needs to filled online and you get a cash card back for the amount. new line of service needed. but I think you can cancel once you get the cash card back.
Better than the direct TMobile offer with Bill credits.
direct link:
http://membershipwireless.com/con…18_TMO_GS9
credits: found it in Reddit.