Cheap Mannequin head?

I'm in the process of buying the materials to make my second fursuit head (super excited!), and I decided that this time I want to base the head off of a balaclava. Does anyone know if I could get a cheap mannequin head under $20 that is pretty much true to size? I've learned from others mistakes of going cheap and having a super small head that doesn't fit them, and I'd rather not have that happen ^^;