Airsoft is a term used interchangeably to refer to one or both of the following subjects:
A game in which players participate in the simulation of military or law enforcement combat with replica military firearms and military-style tactics
A replica firearm scaled either 1:1 (or perhaps as a ‘mini’ or ‘3/4′). It may be of metal or plastic, and usually fires 6 mm or 8 mm spherical projectiles weighing 110-600 milligrams (known as “BB”s). "
and no there simply aren't any cheap "good" guns right now that's selling in stores
ASC classifieds might have some but you'll need to be age verified to buy