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.So you see, the response requested is indicated in the very form and name of the document itself. The Letter of Intent has no established place in International trade law. Where they are used _ rarely _ is in some small niche internal markets and trades. The RFQ, Request for Quotation, a standard protocol in the business world, is what most brokers actually want when they err in using an LOI.
Especially when, in effect, what is being asked of them is to provide the LOI upfront to a little_known Internet_generated seller about whom they lack any familiarity with or whose bona fides as sellers they know next to nothing about _ other than, perhaps, that they (the buyers) had had some initial communication with the "seller" via an Internet contact.