I'm sorry, but I decided to purchase from someone else just before your reply came. By the way, I am also looking for the following items. If you have them and would consider selling them, please let me know.
I am sorry. The person who wants to buy our item has decided before you. I am also looking for the following items. Please let me know if you have them for sale.
I'm sorry that I came to decide to purchase from another person a while before getting your answer. Just take your note that I'm looking for the items below. Please let me know if you consider selling them from your possession.