There are a lot of older folding cameras for under $30. You probably can pick up a Kodak Reflex TLR, which should be one of the better cameras for $30 or under. And there probably are still some boot sale, flea market or yard sale deals where you get a Rolleiflex or Mamiya or something else for an incredible deal.

Generally, however, you'll get a camera of modest specifications with a modest lens for $30 or less.