Hi roblumba,
There are some other stretch cotton protectors listed in the mattress protector post here but I don’t have any personal experience with them so I don’t know how they compare to each other in terms of thickness or stretch so you would need to talk with each of them to find out more specifics.
There is some forum feedback about some of them that may be helpful about the Suite Sleep protector here and in posts #17 - #20 here and the Vasilo protector here and here and the Berkeley Ergonomics/European Sleep Designs protector here that may also be helpful. I don’t know the prices off the top of my head but some of them are less costly than the Cozy Pure and some of them are more.
Phoenix