I coud not find any SOS notes refill pad for folders in my town stationer's shops. Even in the biggest malls there was no SOS notes refill pads available. They, simply, do not sell them.
Oxford notebooks are great: high quality 90 gr. paper, that is perfect to use with fountain pens.
But, I do not like bounded pages, I prefer single sheets. In fact, I think that the most impotant "niche" for this easy-to-scan paper notes are the single sheets, because you backup them with a set of photos.
So I create my own version.
A set of "hand-made" scanneable refill pads (from mobile phone app). It is based on SOS notes Oxford notebook, so it's compatible with its app for Android and iPhone.
Distributed under Creative Commons Licenc 4.0: Attribution + Noncommercial + ShareAlike
Please, consider to buy an original SOS Notes Oxford notebook, it offers a great writing experience with high quality paper.