I recently purchased 3 packs of page protectors from Stampin Up, they are under $5 a pack. You get 2 each of 5 designs for a total of 10 page protector's. Right now in their Holiday catalogue they are current and purchasable. They are for an 8x8 album.
I took a piece of printer paper and drew the shape. Its just an estimate.
I then measured each pocket and drew them in.
Used the grid lines to help line things up.
I will put these in a folder by my desk and use them for a reference instead of always forgetting and having to remeasure the pockets all the time.