I get mine from WalMart, cotton ticking, it's blue or red striped...I quit using prelubed because they were burning through with 80grs of FFF Goex...If you buy in bulk and lube a few as you go then the cotton fibers don't break down...

I now make my own lube, but used SnoSeal for about 25 years...Some guys use Olive Oil, some Crisco,
I even know a guy that uses wheel grease...