And while we're talking about PD books, the folks at
DPC can always use more volunteer proofreaders. They have a huge backlog of books, and if you have time, they can use the help. You don't need to know much about proofreading, and you don't have to commit to a huge amount of time, but if you think what they're trying to do is valuable, and you have any time at all, consider joining. (There are similar efforts in other countries, but Canada's is one of the better organized and especially important because we're a Life+50 country.)