The first six Star Trek films are collected in a pretty polished Blu-ray collection, alongside a bonus disc featuring The Captain's Summit, a slightly misnamed hour's worth of roundtable discussion with William Shatner, Patrick Stewart, Leonard Nimoy and Jonathan Frakes, and hosted by Whoopi Goldberg.
That's not the only supplement, though – there's plenty more, varying film by film but including commentaries, deleted scenes and interviews.
Today, the set is going for $29.99 at Amazon as their Gold Box deal. That's under $5 per film, just about, or under $10 per even numbered film. I've just ordered mine. I have it on pretty good authority it's a fully Region Free set, despite Amazon's comments.