In most cases, one has typically several items to check, and one needs to select the best buyer/vendor for the entire collection of items. In this case, first store all your items in your cart at Bonavendi, and then open the cart view by clicking on the small cart icon on the top right of the screen.
How do I find the best buyer for my items?
When querying the sales price for a single item, the buyer with the highest prices is shown at the top of the list. The same goes when you query the purchase price for a particular item, then you will see the vendor with the lowest prices at the top of the list.