We will be changing our ebook release strategy, primarily because of our distributor, Lulu. We have never had any real problems with the company for print fulfillment but their ebook distribution has been problematic. This was more so in 2020 after their complete redesign of their site and interface. Some of our ebooks never did get to where they should be and we did get tired of attempting to straighten it out.
Now, they announce that there will a charge to distribute any new ebooks. This was enough to decide us to distribute directly from now on, to Amazon and other sites. This means we will no longer need to give Lulu a cut of the profit (much less pay that initial fee). It also means we don't really need to allot an ISBN to the ebooks. That saves some expense too. Of course, it's a little more work for us.
In time, we will probably move the distribution of all our older ebooks away from Lulu as well. There's no great hurry on that. And we will continue to sell them directly on our store there, along side the print editions.