Most expensive things are generally the reception (venue rental, food, alcohol, and any tables/chairs/linens rentals) and the photography.
So I would look for somewhere where you can bring in your own caterer and alcohol (so this eliminates hotel ballrooms). This will save you a lot. I would start planning with this because this will take up the largest chunk of your budget.
If you want to save on photography hire a student or hire someone for reduced hours (3 hours for example).
The biggest area you can save is in decor IMO. DIY your own flowers or do something else entirely. Flowers end up being way more expensive then anyone thinks in the beginning. Make your own centerpieces, using candles or whatever. Buy flowers in bulk online if you want to use some.
You could look for an inexpensive DJ or do an iPod one. If you have a family member who is willing do man the iPod then you can go that route.
Easiest thing would be to make your own cupcakes instead of a cake.
Look for one of those $17 for $70 groupons for Vistaprint. Use that for your invites. Or create your own and have them printed
If you can do it in your state, have a friend marry you. Don’t pay for an officiant.
Get rid of anything unneccessary. No limo. No favors (certainly nothing that costs over $100). No one will remember any of this except you.
Look for your dress as a preowned one, or you can order a replica (a lot of others on here have done that). Otherwise, you can try places like Macys, Nordstroms, or JCrew…they often have simple dresses that are sometimes cheaper than going to a salon.
If you don’t want a Saturday night wedding a lot of people save money by having a brunch wedding or only cake/punch reception. This wasn’t for me because I like to party so I’m paying more to have a Saturday night one. But if that sounds good to you, it’s easy to save money by doing it on a Friday or Sunday or having it during the morning/day.