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Welcome to Just Answer and thanks for your question. There are some excellent sites online with great recipes, but I don't know of any that plan your shopping list for you. You would need to read the recipes and make your own grocery list.
Because you aren't buying expensive meat, vegan eating is nominally cheaper
http://www.veganmainstream.com/eating-vegan-on-21-00-a-week-the-food-stamp-budget (This one does have a shopping list).