I am not making perpetual calendars this year, but if I were (and if I ever do in the future!) THIS is sheer brilliance from the good old people at Purple Onion Designs.
Check out the website for more specific instructions on how to use the set, but it can be used year after year after year (until 2025!!). Seriously. Sheer brilliance. And.... true to Purple Onion fashion, the whole set is only $26! Pretty cool, huh?