To me these sites are great for project/IT work. But say I'm organizing a party, and I need sound equipment. I'd like to get quotes from different companies wh

To me these sites are great for project/IT work. But say I'm organizing a party, and I need sound equipment. I'd like to get quotes from different companies who rent sound equipment in my area. Or say, I need some caterers for the event. I would like to find out if they can provide me with what I want, without calling each of them.