I got the BluRay of Star Trek - The Original Series when it came down to below 70 bucks for all three seasons. I'm watching the version on the discs that have the original effects. The Bluray discs let you switch back and forth between the original effects and the re-mastered effects that were done about 10 years ago. They did a nice job on the new effects and in general the episodes look great. I borrowed the re-mastered versions from Netflix and watched them back in 2012. The DVDs don't have the original effects so it's been nice to see those. When I watched the DVDs it was the first time I'd seen them in 2-3 decades.
I'm enjoying the series all over again but can't imagine posting big long posts about them all over again so I'm linking to those posts below and adding Star Trek and Star Trek Season 1 in the Categories list. You can click on that link and see the same posts but in a backward order. I wish Typepad had a way to reverse the posts so that Disc 1 came first but not enough people much have asked for that. I'll do the same for the other seasons when I get to them.
Season One is on 10 discs in the DVD version but only 7 in the Bluray version. Here's the original posts on the original series.