Ibn Abi Husayn (may Allah have mercy on him) said that the Messenger of Allah (peace and blessings be upon him) said: "The owner of the merchandise has more right to name its price first."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 11187
Imam al-Zuhri (may Allah have mercy on him) said that the Messenger of Allah (peace and blessings be upon him) passed by a Bedouin who was selling something, and he (peace and blessings be upon him) said: "Close the deal at the first price offered, for profit comes through leniency."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 11188
Khalid bin Abi Malik (may Allah have mercy on him) said: I sold something to Muhammad bin Sa'd (may Allah have mercy on him), and he said: Give me your hand so that I may clasp hands with you, for the Messenger of Allah (peace and blessings be upon him) said: "Blessing is in clasping hands."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 11189