Hi there, thanks for this question! Just like with a non-vegan diet, there are ways of making it cheaper or more expensive depending on the products you grab for. There are plenty of reasonably priced vegan products and alternatives on the market, and there are also just as many overpriced/expensive options. I would look at the things you want to replace, and then do a bit of research about what alternatives are available near you. For example, if you want a replacement for chicken nuggets, look up what vegan chicken nuggets are on sale near you.
Just like with meat, own brand products tend to be less expensive, so if you’re looking to cut costs, that could be a good place to start. If you think something seems too expensive, there are so many options available now that you can probably find the same thing or something similar for a cheaper price elsewhere. It is definitely possible to be a happy, healthy vegan on a budget, and while it can be expensive, it isn’t inherently so.
I hope this helps