It took us well over a year and over 40 bookings till we found the best Airbnb towels and sheets for us, and they were the cheapest.
When we were starting with our first Airbnb, we had sheets with cool designs, different colors and the same goes for the airbnb towels. But after the first booking, we had bunch of stains that were almost unremovable and needed bleaching. Bleaching is not suitable for colors so, we bought new ones.
With time we learned that the sheets do not necessarily need to be the ones from the Airbnb photo, or similar.