Good morning Cheyenne,
I am not sure if this will be helpful or not, but we found ourselves in the same boat as you. After reaching out to a couple companies and finding their pricing too high for our budget, we decided to offer a Halloween makeup contest where our patrons can either work solo or form teams. We will provide makeup but they can also bring their own if wanted, and we will have a slide show going with photos of Halloween makeup ideas to help with their inspiration.
As a prize for whoever wins the contest, we will put together a Halloween themed basket.
Good luck on your program!
Also, as a side note, you might reach out to a neighborhood salon and see if they would be able to offer something similar - they may charge considerably less than other companies. Or, put out a request to patrons in your community to see if anyone has a secret skill you are unaware of.