Tire Rack (online?) shipped your purchase to Discount Tire (brick & mortar) who did the installation, right?
Whatever works is fine by me.
Your purchase deal AND the manufacturer's rebate are a great 'double savings'.
How much did DT charge for installation package (mount/balance/disposal)?
I'm such a fossil, I'd never think of your course of action.
It's wasn't Tire Racks Website. It was Discount Tires Website.
Disposal Fee $14.00
State Required Tire Fee $4.00
Install and life of tire Maintenance $100.00