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It's not as simple as that. A usb stick has no processor - it's just storage. You can run Kodi from a USB stick (using Openelec) if you have a htpc. Or you can install Kodi onto something like an Amazon Firestick, which connects via hdmi.
So a £20 markup for a few minutes work installing Kodi? Seems crazy to pay that?
Personally I've found the firestick to be rather underpowered to provide a good Kodi experience. Fine if you just want to watch dodgy streams, but not much good for anything beyond that.
You can intall to Memory stick, then put it into any pc or laptop that has internet connection and run it from the memory stick, it will be using your internet connection and the computers cpu and memory to run, i have it installed on a flash drive myself.
Plenty on Youtube concerning this procedure.