Among these, there might be items useful to them in a time when magic had ceased to work.

Before that, they are simply useful items, but not commodities.

I believe there may be a few useful items in here.

This acts as money and can be used to purchase information, or other useful items.

The rope had been one of the few useful items rescued from last summer's attack.

When in potential danger they carried a number of useful items, apart from weapons.

The player has health, lives, a score, and a set of useful items.

A useful item for any physician to have on hand, I thought.

The scattering of items useful to a given task or problem.

If I had treated them well in the past, they might also send me useful items.