Lisa, my mum got married 31st October (on halloween!), and she literally did it on a shoe string. As her and my step-dad had been living together for quite some time, people made contributions to the wedding as wedding gifts, rather than buying stuff for their home as is more traditional. I think in the end the only thing they paid for themselves was the registry office and DJ! Maybe that is something you could consider to cut costs?
Also, I make wedding invitations! I made my mums as her wedding gift, and been trying to get them on ebay ever since... just not had the time cos of uni x