Way to "remotely" check what items Griswold, Wirt and Adria have for sell

[a337010]

Is there is a way to "remotely" check what items Griswold, Wirt and Adria have for sell without needing to talk to them? I've found only the utility called "Items Thief" but it doesn't seem to work with v. 1.09.
Any reply would be greatly appreciated.