That's a great question, but there's currently nothing in the game like that. It might be that a cloth bag is a little too general purpose for Blizzard's liking, but I'm not really sure. This would be a great question to ask on the general forums and see if a blue appears to answer.
Is there a way to turn off cash flow comments in the chat?
Yes. If you right click on the chat window, then select chat options, then browse around the different checkboxes, there is an option to stop gold transactions from being announced.
When I install Cataclysm, does the purchase of the expansion include game playing time, or do I need to add more in order to be able to play?
Unless you have a subscription going, you'll need to add more in order to play. Cataclysm doesn't have any subscription time attached to it.
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