Managed to get this today I will post how it's done below. The B.B. employee just doesn't check hand them your phone and they will PM, to Apple.com
#1. Go get the 1TB Gdrive Which is USB-C at your local BB
#2. Take it to the register bring up this website on your phone.
#3. Show confidence ask the cashier to Pricematch it and hand them your phone.
It's a slightly different model. But all the cashier sees is 1TB and USB-C
Worked for me today alot better than all the Seagate and WesternDigital 5400 RPM drives for the same price.
The GDrive is USB-C and 7200RPM not bad for an external back up. It also brings a standard USB-C to USB 3.0A cable to plug into any USB port.