There are lots of great (and free!) websites available with ideas on how to save money on your wedding. I have received plenty of ideas from the internet for my $8000 budget wedding. I mostly use theknot.com but I have also just googled things like "low budget wedding" and "cutting costs on your wedding" and helpful ideas have popped up. Here is some of what we are doing to cut costs:
1. cutting out transportation costs by using our own vehicles rather than renting a limo
2. having a cash bar rather than open bar to eliminate the cost of the bar tab. If you are worried about that looking "tacky" then cut out the alcohol altogether, or just serve wine.
3. using candles for center pieces rather than flowers since they can be quite expensive
4. finding a dress on sale
5. getting the groom's tux rental for free if the groomsmen all rent theirs at the same store
6. get a small two tier decorated cake, and have sheet cake in the back cut up for guests. This is much cheaper than buying a large tiered cake to serve all the guests with, and they won't even notice the difference.
7. we are serving a buffet meal at a local restaurant that was a reasonable price ($18 per person) but if you are on a very tight budget you could have your wedding at a time when it doesn't overlap with a meal. You could simply serve deserts or hor d'oeuvres at your reception.
8. skip the wedding planner and plan it yourself
9. do as much as possible yourself and with your friends and family. We are making our own center pieces, decorations, invitations and save the dates.
10. we are having a relative take our photographs since they are amateur photographers and have professional equipment. This will save us about $1000 or more!