Many professional agencies work for free for non-profit agencies in exchange for freedom to do what they want. This is because most paying clients impose demands and limitations as to what their advertising can be. This can be frustrating for creatives who dislike limitations on creativity. So if you’re willing to give advertising agencies the freedom to do an edgy project not confined by rules and requirements, they might work for almost free. If you don’t have money, give them the freedom to create something interesting. Money isn’t #1 for creatives.