It’s always good to get someone who knows what they’re doing. But, with some research and effort, you can do find sponsors yourself and save the money. It’ll amount to finding sponsors so that you can place products of theirs in your film(s). Research how to approach potential sponsors. You’ll find information on how to do that. Once you find the information, go to work and get your sponsor(s)!
This will require following instructions on how to pitch (always show the potential sponsor how they will benefit by placing their product in your film, and/or by sponsoring your film). Once you learn how to pitch, then you will learn how to write a pitch letter. Once the letter is written, then do research to find corporations, companies, individuals, organizations, etc. Once you find those you want to whom to send your letter, research who you find to locate individuals who are involved in marketing within these corporations, companies, organizations, etc. Address your letters and send them to these individuals.
Happy Sponsorship Hunting!
Donald L. Vasicek
Olympus Films+, LLC
The Zen of Writing
http://michaelc.nextmp.net/wordpress
dvasicek@earthlink.net