I have just received a reply to my email from Warners UK & they have confirmed to me that there will be no more Waltons seasons past season 4.
So you will have to buy it from the US (Region 1) or perhaps from amazon.de (Region 2). The only things against the German choice is the packaging & the cost, the dvd's are in English/German with English/German subtitles. The US version with English packaging would look nicer, & works out a bit cheaper but there are no English subtitles only closed captions - which can be seen using a closed caption reader or some PC software such as PowerDVD.
NEWER INFORMATION
All the rest of The Waltons Seasons 6-9 & The Waltons Movies all have English subtitles.
Seasons 5,6,7,9 & The Waltons Movies play on my Panasonic dvd recorder (unhacked region 2) so you should be able to play them on any player. Unfortunately season 8 won't so you will need a multi region player or a cheap player that can be altered to multi region - usually with the player remote & some information from the internet on how to do it!!
The reason I say a cheap player is because the big brand names, Sony, Panasonic etc make it much, much harder to do.
Or you can play a different region dvd on your PC providing that you have a software player installed.
UK PC users please be aware, that when you play a different region dvd in your drive, that will count as a change & you only get 5 in total. Whatever your 5th change is will be permanent (unless you are a PC wizkid & can find a way to reverse the change).
If you have already alternated different region dvd's in your drive & want to know how many changes left do the following:
1. Right click your dvd drive in My Computer
2. Select Properties from the list
3. Select the hardware tab
4. Highlight the dvd drive (not your hard drive)
5. Click on properties
6. Select DVD Region
You will now see information telling you about changes & how many you have left.