It's time to be a hero! By day, they are Connor, Greg and Amaya, but by night they are Catboy, Gekko and Owlette - PJ Masks. Colour, stick and play in ... We analyzed the price history for the Power of Three: A PJ Masks Sticker Book with Amazon price historical data. This item is manufactured by Pat-a-Cake. It is sold in the category Books. Amazon have it for sale at 4.99 £. We noticed a higest price of 4.99 £ and a lowest price of 3.00 £.