Most expensive item you found from venders?

[bobbyluuu]

Was watching a youtuber doing a blind let's play of Fallout 4 and a guy named lucas was selling a mantis left greave worth 15795 caps and gave you 16 normal damage resistance, 23 laser [ or plasma] resistance and also gave you 1 agility and perception. The Mantis left greave had a star by its name.

[Xeonic]

same guy same item 25k caps