I wanted to be able to have a customer in the front end log in, choose products, choose quote instead of purchase, then the backend shop owner sees that there is a quote, and can edit the pricing and send back a revised quote. Then the customer can accept it and go through with normal purchase but there was nothing available. VMQuote was the closest but was only backend, so I contacted the developer and they made it happen for a very reasonable fee. Very pleased with the expertise and service of these guys. Happily recommend.