Graveyard shift at Denny's, Village Inn, Perkins, Egg Platter, etc. - Whatever you have in your area. I am not joking. You'll find big butt girls, tattoos, high degree of willingness and low income expectations. Not to mention a little self-hatred and often lesbian tendencies (if you intend to film that). Once in a while, they're even pretty.
Still looking for the magic spot to find the male equivalent, myself
Porn-worthy amateur twinks too often know it and want a Mercedes for their first shoot.