I have been on a nostalgia kick and have been trying to acquire DVDs of the original Tenchi Muyo OVA series. While Tenchi might seem a bit tired today, that's because so much of what has come since has tried to copy that formula. It's an important piece of anime history. But let me tell you something: it's friggin hard to find. There have been lots of spin-offs and reboots of Tenchi but I don't care about them, I just want the original series. Unfortunately this is where things get horribly confusing...
There are 20 episodes of Tenchi OVAs but they were not all released at the same time. They're actually split into three subseries. The first two OVA series were licensed by the now-defunct Geneon and nobody else picked them up so they're completely out of print. That's the first 13 episodes and they were split across 4 discs, and it was released just under the name "Tenchi Muyo". In Japan the entirety of the OVAs are known as Tenchi Muyo: Ryo-ohki, but Geneon dropped the Ryo-ohki subtitle. Funimation picked up the third OVA series and decided to release it with the Ryo-ohki subtitle. And then, just to make things more confusing, they put out something called the "Tenchi Muyo: Ryo-ohki Complete Collection". But it's not complete at all! It's just the third OVA series. Since Funimation is still around, that much is still in print and easy to get.
Following so far? So the problem is getting the 4 discs that make up the first two OVA series. Oddly enough, the first disc and just the first disc is actually pretty easy to find. I don't really understand why. I guess they must have printed more of them or something. So I need to find OVA 1 disc 2 and OVA 2 discs 1 and 2 (or is that OVA discs 2, 3, and 4...). Part of the problem is that there are so many Tenchi series that if you try to just search for "Tenchi Muyo disc 2" or something on ebay you get a lot of irrelevant results. But you can't stick in "Ryo-ohki" since it's likely that they're not listed with that name. Anyway I have found some stuff on ebay, but Jesus Christ is it expensive. I found people selling the complete set of Geneon OVAs (that's a whopping 4 discs with 13 episodes) for $250!! Used. That's like $20 an episode. So yeah, that's a rip-off, especially since the first disc can be found relatively cheaply. If you're willing to shop around and get each disc from a different seller then I've seen discs 2-4 go for around $40-50 each (again, used). That's still pretty darn pricey. But there really aren't very many listings for them at all (at leas that I've found, see search problems). You kind of have to jump when there's a chance.
So yeah, it's a complete friggin mess.