Is it bad business etiquette to show vendors each others' quotes?

Suppose I am looking to purchase parts for my company and I quote three vendors. Suppose Company A is lowest. Would it look bad to send copies of Company A's quote to B and C, and see if they could go lower? How about then go back to Company A and try to knock them down some more? Is there any way I could... show more Suppose I am looking to purchase parts for my company and I quote three vendors. Suppose Company A is lowest. Would it look bad to send copies of Company A's quote to B and C, and see if they could go lower? How about then go back to Company A and try to knock them down some more? Is there any way I could get in trouble for doing this?
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