Home Slickdeals COSTCO – New or Existing T-Mobile Customers – $200 Instant Rebate with... Slickdeals COSTCO – New or Existing T-Mobile Customers – $200 Instant Rebate with purchase of Samsung Galaxy S9, S9+, and Note9 (on top of existing reduced price) By ARCOM - 6 January 2019 169 0 SHARE Facebook Twitter Go to the deal page: COSTCO – New or Existing T-Mobile Customers – $200 Instant Rebate with purchase of Samsung Galaxy S9, S9+, and Note9 (on top of existing reduced price)