There's probably several options at $300 to $350. No conventional kits/ARF's I can think of you can get in the air for much less.

However... visit ww.spad.org They've got plans (free plans!) for a trainer made from corogated signboard plastic and PVC gutter downspout. Costs about $15 t0 $25 in materials (including wheels and bolts) to build the aircraft itself. Add a radio similar to the Tower System 3000 4-ch, and a Magnum XL .40, (and a can of fuel and a glow ignitor) and you'll get in the air for under $250 easilly.

I recommend sanding the corogated and PVC where your are going to glue it, rather than the site's listed metod of "flashing" its surface with a propane torch. All you're doing is removing a thin film of oil or wax from the surface of the plastic. 280 grit sandpaper buffed over the surface will get it, and no risk of melting the signboard material.

There's a LOT of neat lookng designs at that site... most are NOT appropriate as trainers. The two pictured on the left side top of the opening page are good as trainers.