Iatee, I got a big cheap one from target that has been working fine for a couple of years, I think it was around $30.
Just make sure it has a tight-fitting lid, and a good timer is useful. Mine only has ”low” (6-8 hours) and ”high” (2-4 hours), and it doesn't switch off, it switches to warm.
― just1n3, Tuesday, 25 December 2012 17:31 (eleven years ago) link