Just a heads up- once you do find your copy of OS, I've been using "Disk Maker X" with great results.
I work IT so supporting all of the operating systems is a bit difficult, but I've loaded up almost every version of OS onto a flash drive (some multi-boots) with great success.
Give it a try!
Your SD card will work just fine- even if it is a cheap one, but do know that the cheaper ones will have more errors in the reading and writing process than higher quality ones- increasing the percentage of a corrupted installation.
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