Blu-ray disc prices have dropped a lot the past few years.
For me, $34.00 for the first season of TOS in HD is totally worth it. C'mon - it's like a dollar an episode - and it's the best of Star Trek has ever been.
And it's still money spent for little gain when I can spend it elsewhere for greater gain, like maybe getting something I don't already have.
Then again I can just not spend anything---a wise option presently since I'm between jobs and in no hurry to burn through my savings until I have a regular income again.