Hybsk 50x30mm Portable Printer Label Paper Multi-Purpose Tear Resistant Direct Thermal Labels Self-Adhesive Stickers Compatible with P50 Label Maker (50x30mm,White Lable,2 Rolls)

So, before I had the printer, I bought paper to try it out for drawing on...and I now use that same paper in the printer. I am using the non official paper https://amzn.to/3Jnhxlw If your printer handles different sizes, you could always purchase precut rounded labels, like I did.