Extending Price Match to be a quote based system would be a good idea. For example Vendors receive quote requests from Customers and can reply back with a price offer. The Customer could then accept one quote from multiple Vendors or Site Owner and have it processed as a normal order.
Further enable customisation of the form fields and types/values as well as decouple from products so this could be assigned to a category or topic page or website header/footer as well.
It would be a very flexible and universal plugin then and could be used for Price Matching, Quote Requests, general enquiries fed into the usual online orders process and extend the nopCommerce Vendors system at the same time.
Thank you for your suggestions!
Regarding the Request a Quote functionality we believe it should be a separate plugin.