What days are you looking on? I'd imagine that most venues would be reluctant to let you have a prime Fri-Sun slot, as this is where they'll make most of their money, but have you tried contacting venues about midweek weddings?
Also, have you considered maybe having a registry office ceremony - there are some beautiful registry office ceremony rooms out there - and then going to a fancy hotel or wherever? I was looking at places the other day for our honeymoon, and you can hire a gorgeous cabin, and you could arrange to come and have a chef cook for you in the cabin! Wedding breakfast and mini-moon all rolled into one!
Hope this helps! X