I know this is way late for the original question, but in case anyone else reads it…
A great way to find out what to charge for anything, assuming you’ve never done it before as was this instance, is to call a local production company and describe to them the situation pretending that you are a potentail customer seeking a quote on price. They usually give out what is a standard pricing set for their company based on your supplied info. If you call several production houses in the area and average the given prices, you can get a pretty good idea as to what to charge. It also lets you stay competetive.
P.S.
Don’t give out your real name to them as they will recognize it later and possibly black list you. It’s nice to be able to use them for duplication and stuff sometimes, so don’t burn your bridges.
