Is it cheaper to be a vegetarian?

Like any "diet" you can eat on a budget or splurge. It depends on your shopping habits and cooking skills/preferences. It CAN be expensive if you want to just "substitute" everything an omnivore might eat with store made vegan alternatives. Those are pricey. On your own, fruits, vegetables, nuts and grains are not as expensive as buying meat, milk, eggs, etc. Shop for what fruits/vegetables are in season. Buy your grains in bulk. Make your own "veggie burgers" or other alternatives.