Looking for virtual trade Mod

[spillage]

I've just spent 5hrs searching this site, and haven't found what I'm looking for.
Maybe someone can direct me a Mod.

I'd like to have a virtual trading area.
Admin sets basic "item" types.
Members have a list of "items" on hand.
Members add "items" to their list.
Members customize "Items" with an associated note.
Members can pass their "items" to other members.
Maybe have an associated "item" avatar/image.

I guess this is like a mini database.
Any thoughts as to an existing Mod that might work would be greatly appreciated.

THANKS