Another unforeseen expense? Feeding your wedding day crew. Before you sign the contracts, make sure you're not required to serve the same meal to your vendors that guests will receive. Otherwise, you could be paying for 20 additional lobster tails. Choose a less expensive (but equally hearty) meal for them instead. You will have to let your wedding caterer know a couple of days before the wedding exactly how many vendors you need to feed (don't forget photography assistants and band roadies) and what you want them to serve.
Of course you want the perfect stamps for your wedding invitations. But not all stamps are widely available at every post office, especially in large quantities. Save yourself scouting time by ordering them online at USPS.com. And be sure to weigh your invitation and all the additional paper products before you send them out so you can attach the right amount of postage. Ask your stationer about the need for additional postage for oddly shaped envelopes.