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I've seen several times that people offer goods for sale on the Diablo 3 trade chat and add the letters "co" or "c/o" what do they mean by it?

From the decisions it seems to be some kind of auction because the messages usually go like:

WTS [something] 50k c/o pst with offers

WTS [something] 100k c/o pst with offers

WTS [something] 150k c/o pst with offers

[someting] 200k c/o going once

[someting] 200k c/o going twice

[someting] 200k c/o sold

What do they mean exactly, and what does the abbreviation stand for?

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Cash only would be my guess but I've never seen it before – Halfwarr Jul 8 '12 at 6:45
Another good acronym to know is BO, for Buyout (price). Also, WTS (want to sell) and WTB (want to buy). – BlueRaja - Danny Pflughoeft Jul 8 '12 at 21:33
b/o is another alternative for Buyout, and WTT (want to trade) is a very common term as well for most MMOs. – Confuzzledmaniac Jul 9 '12 at 5:02
up vote 7 down vote accepted

C/O or CO means 'current offer'.

This refers to either the current price at which the seller is offering the desired item, or the highest bid thus far from another party interested in purchasing the desired item.

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Also, a 'BIN' may be mentioned, i.e. Buy It Now (buyout) price – Alok Jul 8 '12 at 13:06
Alternatively, they may use BO, also for Buyout. – Frank Jul 11 '12 at 16:04

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