Where to get sanding sheets for Ryobi RPS18-0?

Aliexpress? They have pads which are a superset of various hole patterns, eg:

(although aluminium oxide must be pretty commodity now - these aren't the fancy 3M Cubitron kind)

Theo

Thanks, but their hole pattern doesn't match the Ryobi one. Some positions are different and there is no centre hole near the "nose"

How about getting some "mesh"[1] round discs, plant them on the sander, place it on a flat offcut of board and trim round with a utility knife. (in fact you could probably trim several at once)

That's an interesting idea. I'm sanding an old Oak door (from dark brown stain/varnish to light Oak) with a mix of Mak 5" and 6" ROS, Bosch 1/3 sheet OS, Ryobi detail sander, scrapers and a lot of hard work. It's eating sandpaper at a prodigious rate.