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We offer an opening/closing for urns that we do our time for $295. Otherwise, it's $695. The urn vaults I start with are $675, I believe. So, all in all, it seems on par. I don't know that market specifically. We do put 2nd markers on graves if there's room. That cemetery might have a guideline where they'd have to put both names on one marker.
If it is not opened, maybe a few months, but if it has been opened I would just throw it out. I'm not one to mess with expiration. Buy some ON, google that and you should be able to find alot of shops online. Usually 2lbs goes for $22 and 5lbs for $38.