Do you have opportunities to purchase a memorial for someone who has died? Something that is permanent at the temple?

Temple authority would be able to provide you with apprpriate answer

Yes you can sponsor stone

Better get in touch with temple authority, they ll guide you better

You can sponsor for a stone in the temple and it can be used as a memorial. Please check with the temple authority.

I'm not aware of any such thing in this specific place. But I'd suggest you contact the temple management. They might have something.

No not at the temple