That's an interesting strategy. I hadn't thought of doing that!
I'm sure you can deal with Best Buy long enough to get in and out with what you want.
I've had several credit cards or airline miles accounts over the years and always gone to see "what I could get" with the rewards points. None of it ever struck my fancy.
I did a little bit of research about how it might be possible to pool points between various airline accounts, but never took it to conclusion. In the end, I lost a lot of 'rewards' due to inactivity.
On my main credit card there's an option to just get cash instead of prizes, so that's what I do every couple of years.
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10101311 (20GB- backup empeg)
10101466 (2x60GB, Eutronix/GreenLights Blue) (Stolen!)