For our wedding, we bought a disposable camera for each of our guest tables. We were so excited to have them developed to see what all our guests captured. Our recommendation to any bride/groom that wants to use this idea...DO NOT DO IT!! It's a huge waste of money. Our reception was darker, so unless you were on top of someone, the pictures were too dark. Plus, so many guests took pictures of the floor or table or their beer bottle, it was ridiculus. We threw away more pictures than we kept! Plus, you cannot zoom in with them, so unless you're next to someone, they aren't going to turn out.
Don't waste your money on the cameras or on getting them developed. You will be highly disappointed.
That's my recommendation.