Vanuatu and Palau are also out. I believe those were the last 2 released.
The only ones I have on DVD are Borneo and AS. Never watched AS on DVD and don't care to, but just bought it to have for my collection. The Borneo DVD comes with a special DVD called 'The Greatest and Most Outrageous Moments' that has unaired footage, all the confessionals when the contestants voted someone out/were voted out, audition tape clips and interviews, and some of the highlights of the challenges and different moments that were memorable. Outback also comes with that same DVD for their season. Those were actually the first DVD's ever released of Survivor, before they started putting the entire seasons out. Borneo also has commentary with Gervase, Rich, Rudy, and Probst on the first and last episodes and has an interview with those 3 contestants as an extra.
According to my AS DVD box, it says the special features on there are:
-Never before seen bonus footage from different episodes, commentary by several of the contestants
-A look at the challenge aspect and putting them together, a music video showing highlights of the season, interview with the casting director for Survivor, behind the scenes at the live finale, exclusive interviews with all 18 contestants, and promos that aired for the different seasons of Survivor up until AS
I heard that as of now, there were no future plans to release anymore DVDs, which sucks

I was hoping to get some more of the earlier editions out.