Thank you for the positive feedback, it's always so nice to hear people are using Spilled Ale Studios products!
Actually, sales for ALL products were meant to be suspended on itch, but some apparently were still up by mistake. Details on why I suspended sales and alternative markets on which to buy Spilled Ale Studios books are provided here: https://itch.io/blog/855378/suspension-of-sales. This is actually why it took me so long to reply, for which I apologise. With sales suspended I'm not checking itch.io as often as I used to.
As for the future of the Wasteland Worlds, I consider the series to be pretty complete as it is. Future books depend on the right idea, but I've already covered a lot so it has to be something worth adding. Currently the only idea I'm tinkering with is a final character class... still tinkering with it to see if it works.
Beyond that, I suppose if I work on anything in the future it would probably be a new edition! To which I can only say: we'll see.