Webcams.com are working on their white label software, should be up in 2 weeks.
The best white label site I've seen is CamgirlsLive.com
From Estibot
Alexa Rank 15729
Traffic (Visits / Day) 14,000
14,000 uniques a day is good for a white label site, based on my stats about $7K per day earnings but I'm using fresh traffic most of theirs will be residual traffic so maybe lower. It's small by cam site standards but makes around $2 million a year.