Many of you have asked about that Perfect Notebook.
Here is what I know.
It is a TimeSmart Notes. Item 14713-T Notes TimeSmart Black PP 8.5×11 Wire-O.
I purchased mine at Walgreens. It was $5.99. The notebooks are not available for purchase on their website, but you can get more information HERE. If you have a Walgreens near you, perhaps they will have them available.
There is a selection available on E-bay. You can get more information HERE. More money, yes. But, shipping is included and they do have them in stock (at least right now).
Good luck. If you find another source, please share it in the comments.