Different types of venues:
Beach wedding
Garden Wedding
Park Wedding (Someone had one in a National Park and all that had to pay was a donation which was tax deducatble too! bonus)
Zoo
Golf Club
Hall
Hot air ballooning
Bungy Jumping
Chamber Cave Wedding
Underwater wedding

Most places in say the Brides Diary are the places which charge a fortune (although some dont). Look maybe in your local paper for advertisments.

If you had your wedding and reception at the same place that would save transport costs for moving from one place to the other.