Budget Bytes
Site with recipes focused around being inexpensive! Includes sections for meals under $10, breakfast recipes, vegetarian recipes, and more.
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The Sad Bastard Cookbook by Zilla Novikov and Rachel A. Rosen
Free cookbook available as a PDF with recipes mostly centered around being simple and cheap! Lots of vegetarian and vegan recipes, which are clearly marked both in the table of contents and on each recipe's page.