[Maro]

Assuming your product is software:

Per your description you haven't marketed your product yet, just built it. Since you seem to be on your own, I assume this is a 1-2 manyear effort. You'd be lucky if a company were to pay multi-million dollars for it, as they could just have somebody code it up for a tenth of the price. The exception is if you have some IP which they feel they need to purchase (unlikely) or time-to-market matters that much (I'd guess this is unlikely, because they'll usually need to integrate your stuff with their existing stuff, which takes extra time with outside codebase).

I'm saying be cautious, don't block your progress on this deal, and don't get your hopes up too high. There are no miracles, there is no free money.

I once spent months hammering out the details of a deal with a client (much smaller deal in the $10-100K range), both sides wrote several versions of contracts, they extensively tested the software, etc, and once everything was hammered out, negiotiations were over and everybody seemed happy (all that was missing were our signatures on the finalized contract) it turned out that the whole deal wasn't that important to them, and the deal died off for lack of interest on their part.