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.
This is my signature. There are many like it, but this one is mine. However, my signature is neither my best friend, nor is it my life. I also have no desire to master it and my worth is not signature-dependent.