This site is not a shopping market for armor. Soliciting goods or services for money is against the forum rules outside the classifieds, which you have to earn access to through community participation, and even then, it is not a very active place. We are more than happy to help you make your own though. It's not as hard as it may seem, especially up to the stages you're looking for. If you decide to make your own, people here will gladly offer help with any questions you may have.
That said, you're probably not going to find much of anything in the fifty dollar range even if you find a seller. Finished helmets seem to run around 200$. There is a pepakura ONLY helmet running for 50$ on ebay now (with no takers though), and that's without fiberglass and resin.