I imagine you can do the shoot for that, your $ 30.00 in materials will be eaten up quickly, depending on the expectations the bride and family has on the images. Film makes great wedding images, just how many images are you "contracting" for, proofs, enlargements and other considerations.
My big thought is have a contract (2 copies) signed by both of you with a copy for the bride and yourself. Include as many conditions as possible including delivery time, proof time, prices, reprints. All of it, or do not get involved.
Sell the real photography aspect vs pixels and scratched or lost CD disks.