However, sometimes one of the parties prepares a document believing it to be a valid and enforceable agreement only to find, after expensive litigation, that it was not a binding agreement at all but merely a non_binding, non_enforceable agreement to agree, letter of intent."
But intentions are not binding contractual conditions. Nor need they lead up to binding contractual conditions. Moreover a letter expressing intent, in its form, does not adequately suggest what the appropriate response should be. Whereas a Request for Quotation / RFQ quite literally is a Request. For a Price Quotation. Hence the document's name, it meaning is expressed by it's name. Hence an appropriate response, for a vendor or supplier, is issuing a a price quote.