I went to costco and found this deal. valid between oct 2-8,2020
Membership Wireless via Costco Warehouse is offering Up to $350 Back via Rebate when you purchase an iPhone 11 (listed eligible devices below) and up to $550 rebate when you purchase iPhone 11 Pro, 11 Pro Max w/ New/Upgrade for T-Mobile with Qualifying Trade-In (listed below) valid at participating Costco Warehouse Wireless.
Rebate = One Time Bill Credit via Virtual Prepaid Card
Note, offer valid only at Costco Warehouse. Device/carrier selection may vary by location