I emailed Mike Pratt almost exactly a year go with a similar question. At the time, he wrote:
"The kits for the P-Force are out of stock at this point, the shipping and cost of laser cutting has gone up to the point I can’t be competitive in the Market. I still sell a few plans for the P-Force, $35.00 plus shipping including the instruction book. Hopefully this will change in the future, it was fun selling kits, plans, and providing great flying models."
You could try him yourself to see if anything has changed. prattmike251@gmail.com