Yes unfortunately the store is closed but there is old shielding sigil that you can use at the moment. I forgot where it was but someone posted it and all you have to do is to print the sigil
This is the thread
https://forum.enlightenedstates.com/t/psychic-mental-shielding/16978?u=imogen
For the item. You can choose some ring made from titanium. Or any item you like. But titanium is the best and strong metal out there and lasts forever (: