I don't know of such an AddOn, but I can *ahem* say that printing the message to /say or any other channel will get annoying very quickly for everybody around you. It would be much better as a message to yourself.
Tradeskillmaster is extreme overkill for only this feature, but it does track gold trades in its Ledger tab, along with sales and auctions. TSM does a whole host of other things, but if you only want that one thing, maybe some other commenters can think of a specialized AddOn.
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