There are also the following recent sales (USD) without o/0:
h9.com $15,000 / Sedo / July 2007
s8.com $10,600 / Sedo / Feb 2007
c6.com $15,063 / Sedo / Feb 2007 (Converted from 11,000 EUR)
These probably serve as an upper limit since:
Overture search results (wo extension) for c0 are: 180
Compared to 522 for h9, 1314 for s8, 1483 for c6, and 215 for b0.
The lower limit would probably be $8k for o4.com (mentioned above) with an overture of 75.
The price mentioned above for b0 at 7,500 back in December would probably be over 10k now. Prices have gone up quite a bit since then. But the popularity of the search of c0 seems lower than this.
So, given all this, I'd say 8k - 12k reseller.