The lowest price a Bitcoin sold for on an exchange might have been lower than one cent. There was an exchange called Bitcoin Market that was trading earlier than Mt Gox, but I can't find any charts showing its prices. Here's the announcement posts for both Bitcoin Market and Mt Gox.
Is there a human volume to your market, do you have population numbers as of right now DW?
There are 9 people signed up but only 3 have made a deposit so far. Myself makes 4. Looks like we had our first real trade around noon!
Hi Everyone,
I just put up a new bitcoin exchange.
Please let me know what you think.
https://mtgox.com