Ebay is your friend! If you trawl through them over and over you can find bomboniers and placecards really cheap...same with invites. And they don't look tacky.
Get friends to do as much as you can, my cousin is doing photos as she's done courses and that and a friend is doing my cake for $150. No I would not say it's for a wedding.
Trawl the internet for deals....compare them all and go with the cheapest (not tackiest) option etc.