I may have been unobservant, but I just found out that the material that used to be in the Grantville Gazette (from Baen Books, and then from Ring of Fire Press) is now available on Smashwords.
Search for the author "1632 & Beyond " To find
Eric Flint's 1632 & Beyond issue numbers 1 through 5.
https://www.smashwords.com/books/byseries/98372
This is not on any special sale, but I am glad to see this stuff emerging from the estate of Eric Flint. And poking around, it looks like most if not all of the books previously published by Ring of Fire Press are available to buy from Baen Books.