With the beginning of the new year CFL Systems released 2 new modules for X-Cart 5 -
Price Match Request and
Make an Offer. Soon to be posted to marketplace as well.
The Make an Offer module allows customers to send offers to store owner for custom quotes or to purchase product/service at a discounted price. This is a great way to still make a sale by allowing customers to name their price.
Few screenshots
For more detailed description head to the module's official page - https://www.cflsystems.com/make-an-offer-for-x-cart-5.html