For the DOTD for today (06/13/13), Amazon has the S1-S3 set on BD of Star Trek: The Original Series for $89, plus S1 & S2 of Star Trek: The Next Generation for $50, as well as S3 of ST: TNG for $57.49:
The Kindle version is also available for borrowing if you have Amazon Prime and a Kindle-branded device, not the Kindle app.
Between the two, should cover any device out there (iOS via Kindle, Android via Kindle or Google Play, Windows Phone 8 via Kindle, Blackberry via Kindle) to read these on save maybe a Nook or other non-Kindle/non-Android eReader.
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