My parents won't pay (much) for my wedding?

I'm getting married on August 16th and we thought we had everything figured out but my parents decided they will only pay half of what they originally said. Now.....I'm happy I'm getting anything at all but it's cutting it kind of close and I don't know of any cheaper ideas. We're already getting married at my fiance's grandparent's house and the reception was to be at a banquet hall that doesn't include the dj and photographer and then factor in my dress. Weddings aren't cheap these days and I really think my parents are being selfish. Does anyone have any suggestions on how to make this cheaper or any advice on dealing with my parents? OR----does anyone know of where I can get a cheap dj/photographer/wedding reception site in the chicago area?