I use the Hope pro sander. It’s not the only brand that makes these sanders and the product linked here is an alternative you can find on Amazon.
Here is a link for the Hope sander that I use (non affiliate), they are based in the UK, but do have resellers in other countries: Hope Pro Sander
description for the Amazon product:
Sand on Lathe: The Sander is used for finish sanding and polishing of wood work pieces while your project is still spinning on your lathe.
Rotatable Head: The sander head rotates smoothly with the rotation of your workpiece. This keeps the sandpaper from digging in or causing unnecessary friction which tends to cause burning or marking your wood.
Angle Adjustable: The head assembly can be set and locked at almost any angle.
Protective handle: The 7 1/2” handle covered with soft and durable foam, anti-skid and shockproof, protects your palms from being worn out.
4 Pads in 2 Sizes: comes with 4 foam padded heads, 2”, 3” in diameter, and 10 240-grit discs for each size. For more replacement parts, please search B08BQZM57M (3″ Pads), B08BQZ83ZL (2″ Pads), B08BQZMSR2 (3″ Discs), B08BRBMN4W (2″ Discs).