I also use either Maz covers or BBH Wool covers.

If you can't get Maz's covers direct from her then Mel's (Arimeh) store did have some of Maz's fleece covers.
The Nappy Bucket also sell them (they have nice Minky ones too).

Baby beehind covers, you can go direct to them.

Wool and Fleece are better for overmight, not PUL.

HTH .