Depends on your equipment, but I buy hops and malt in bulk, and have a pretty good yeast bank built up so I don't usually buy yeast. If I am going for cheap, I can make a very basic smash pale ale for under $5 for 5 gallons (5-6lbs 2-row, 1-1.5 oz Belma hops, or whatever is cheapest, and reused...