Eating plantbased can be as affordable as you make it, just as with any diet. You could either live on expensive foods like avocado and pre-cooked meals or you could make your meals from scratch. If you walk into a store and look around, you'll notice that the cheapest things aren't meat or dairy. It's the vegan foods like dried beans, vegetables, potatoes etc.
Do you have any good advice for vegans on a tight budget?
There are so many amazing sites out there if you google "vegan on a budget" or "cheap vegan" but I'll try to link some of the best I've found so far.