I'm just now getting around to clipping coupons from the inserts in the Sunday paper, and found one for oven roasting bags, to put a turkey in. I got to wondering if that would be a good substitute for crockpot liners. i have no idea if they are cheaper or not though. Other than that, I have no idea. Maybe a sheet of aluminum foil from one of those really long rolls, could be molded to fit inside the crock?
I also use the nonstick sprays inside my crockpot.. it's not nonstick either. I haven't seen a crockpot with a teflon coating, but would sure buy one.
If I'm making something like rice that I know will stick, I will rub the inside with some plain old butter. Does a better job than the spray or so it seems. But if I'm doing a beef roast or something like that, as long as there is plenty of liquid in there, it doesn't stick other than a bit around the rim. Again, a good soak with a squirt of dish liquid works on that.