Can I negotiate with a picker, or is the first offer final?

You can almost always negotiate. Many pickers expect a little back and forth and may start lower than their best price. It is reasonable to ask whether they can do better or to make a counteroffer, especially if you have researched what similar items sell for.

Negotiating works best when it is calm and specific. Point to the condition, originality, or desirability of the piece, or offer a package deal if you want to move several items at once.

Keep in mind that a picker's offer has to leave room for profit, so the price is unlikely to match retail value. If the offer still does not feel right after some discussion, it is fine to decline politely. You can get other offers, consign through an auction, or sell the item yourself if you have the time.