What Ludi says. Getting the experts to compete brings out the helpful, educational tidbits too.
If you play a cheaper quote off against a more expensive one, the expensive guy will tell you why you absolutely cannot operate without a somophlange, whilst the cheaper guy will tell you why two doohickeys are way better and more cost effective than a somophlange. You get the best quote and you learn a whole lot more about the field you're looking into.
Some people ask me why I have always enclosed my signature in spoiler tags; There is a good reason for that, but I can't elaborate without giving away the plot twist.