If finances don't allow you to purchase a designer wedding dress, consider renting. Look at it this way, if you're the type who wouldn't even consider wearing your mother's dress, why do you need one collecting dust in the closet.
Never mind buying an expensive silk gown. Stick to polyester blends. They're cheaper, don't wrinkle as much and are easier to clean.
The more beading and detail on the gown, the more expensive.
Most of the big bridal shops have huge sales once a year, usually held at hotels or other big venues.
To take care of the something old-new-borrowed-blue, look to family and friends for items you can use.
Go shopping for bridesmaids' dresses during prom season and after New Years. There's nothing written in stone that says you have to buy your bridesmaids dresses at a wedding shop, and generally your prices will be a bit cheaper elsewhere.
Shop for those pretty little wedding shoes in the summer, when white shoes are on the shelves of every shoe and department store, or you'll have to buy them in a bridal shop and pay their prices. Shop in the afternoon, your feet swell during the day and they'll also be swollen on your wedding day.
Men's Tuxedo rentals are pretty much all the same price no matter where you go. The thing to check on is the condition of the suits and accessories.