I'm working on a client website and I need to place a specialty calculator on it. I may have to have it developed, but before I head to elance, I thought there is a chance this kind of calculator has been developed for other businesses and may be for sale for a fraction of the cost of having it developed from scratch. (It's a California Child Support Calculator. Not many attorneys have them on their sites but a handful do.)
Problem is, I don't know what the big code marketplaces are. I don't normally develop websites, so I'm not in the trenches. Can you guys give me any advice?