I don't know if you bargained for so many words, rav, but here you go.....

http://www.worldwidewords.org/articles/whereat.htm

Quinion mentions, 'at the price of'. In a conversation with my accountant some years back, it was revealed to me that in trade and business circles in India, this symbol is expanded as, 'at the rate of'. Which in turn, takes my mind to something that Nehru once said, (I can't remember the exact quote) about how, in India, the old never gets replaced by the new; the old always co-exists with the new harmoniously.

Edit:
Would you believe, there is yet another one!! This seems to be the most current of them all - 'atmark'.