Have you tried contacting the publisher directly? Go to their website or fire off an email to ask them if they have any to sell avail and/or for a list of companies/stores that carried that line of planner. Then start contacting those stores. They may not have cancelled it, but ask them when you contact them. And if you find some, buy up what you can.
I had the same thing happen with the only water flavoring I use. (Water alone usually has a weird taste.) The manufacturer emailed me back that it wasn't discontinued, but it still took a few months before those not avails had stock again.
TUF wrote:
That's exactly what's gone missing.
Amazon says currently unavailable which in my experience means not coming back.
Nu site isn't selling them anymore.
I can't find them.