Inexpensive and non-corrosive are mutually exclusive.
But who cares? With a bolt gun, shooting ammo with corrosive primers (which deposit salt into the bore that attract moisture, which leads to rust and pitting) just means you need to clean the bolt face and bore with warm, soapy water before doing your regular cleaning. The water removes the salts. Just make sure you clean within 24 hours of shooting, and you'll never know the difference (except that your ammo will cost 1/8th of buying non-corrosive).