Magento 2 Quote Extension is a smart solution for both B2B & B2C business!
Magento 2 Request For Quote (RFQ) allows both guests and logged-in customers to submit request for quotation forms on product pages. Customers can add multiple products to quote with custom price and quantity. Facilitating two face interaction between sellers and buyers, the module personalizes customers' orders and increases their retention, loyalty.

Check key features:
- [New] REST API Support
- [New] Estimate shipping rates & tax rates
- [New] Admin adjust price for all items in the quote
- [New] Convert items in cart to Request for Quote
- Ajax add to quote
- Add Note/Comment for Each Product
- Enable/disable Quotation For Each Product
- Display ''Add to quote'' on various pages
- Convert quote to order in backend
- Move Quote to Shopping Cart
- Customer Relationship Management (CRM)
- [New] Create Quote in Backend
- [NEW] Auto create customer account for guest quote
- [NEW] Limit quote total & product price to submit a RFQ

Link product: https://landofcoder.com/magento-2-quote-extension.html/