FontSpace: A massive library with easy-to-navigate tags for "Spray Paint" and "Grunge."
Behance: Many independent designers upload "Free for Personal Use" font packs as part of their portfolios. How to Make Your Downloaded Font Look Real
Tagging Scripts: These look like hand-drawn signatures made with a fat-cap marker or spray nozzle. They are perfect for logos and personal branding.
Add Extra Splatter: Most free downloads come with a few "dingbat" characters (extra symbols). Use these to add random paint drops around your letters for a more natural look.
Several reputable websites offer high-quality downloads for personal and sometimes commercial use. Always check the license file included in the download to ensure you are following the designer's rules.