How much is a sentinel of light phantom?

Excuse me, could you please provide some clarification on the pricing of a sentinel of light phantom? I'm particularly interested in knowing the current market value of this item. Is there a fixed price, or does it fluctuate depending on various factors? I'm also curious if there are any specific platforms or marketplaces where one could purchase such an item, and what the transaction process would entail. Additionally, are there any potential risks or considerations that one should be aware of before making such a purchase? Thank you for your time and assistance.