You can buy a copy here.
I use these sheets when I teach a new letter, but you could use them as revision sheets as well. A buyer who got the 'before' version said that they have laminated a set and use whiteboard markers with them as part of a writing corner.
Today I have also been working on a new product. It's not quite finished, but it's nearly there. It's all about gross motor skills, which is something I will be working on with my preppies this year.