While I don’t have any books underway at the moment, there are some recent releases available. 365 Build-It-Yourself Engineering Projects came out at Costco in September 2020 and I am waiting to find out about a re-release in stores. I’ll be sure to keep you posted!
On top of that, Quarto (my publisher) re-released 365 Weird & Wonderful Science Experiments as a set of 4 smaller books. The same great projects just in a smaller package!
Unfortunately my other books are out of print for the most part but you still might be able to find them on Amazon or better yet, at your local independent bookstore.