Formula Problem

My son needs to be on Alimentum and I do not think it's working either. He has tried a few already. Don't know what to do anymore. He hates the powdered Alimentum only the liquid but it's super expensive. Can any one help me either find formula where I can get it cheaper or what formula helped a colic baby gassy, won't sleep at night. Fights the bottle. We are tired😢😢😢