Ivory U
I don't find it expensive.
Actually sometimes I find being plant-based is cheaper! Especially with the rising cost of meat.
I recommend: lentils, chickpeas, black beans, tofu, oat milk (I like to eat it with granola for breakfast), multivitamin with vitamin b12, frozen veggie pizzas when I am too busy/tired to cook. Vegan pizzas are expensive but vegetarian ones can be cheap where I am.