CMarket was the best there was when I looked a couple years ago, and it looks like it's gotten financially worse. Before, they stated the up-front and percentage fees, and all I remember is that we could theoretically turn a profit doing it cheaper.
Now, that's hidden in the application process, except for this ill-advised boast:
"Customers earn an average of $5 for every $1 they invest - an astounding 400% return on their investment which is why cMarket has become the preferred online auction provider for schools and nonprofits nationwide." (cmarket.com/run-auction.htm)
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