One way would be to find the JV pages of launches that have a similar audience to yours, and subscribing to their JV notification list, but many would find that method a little disingenuous, unless you actually do have an interest in possibly supporting the launch, or getting to know the merchants behind these launches (which has it's own benefits, JV wise). Aside from the popular launch calendar sites, themselves, there are many JV announcement groups on Facebook where JV page access for many types of launches and evergreen affiliate programs can be found, in abundance.
What type(s) of audience(s) do your products target? What marketing platform(s) are you using?