naked.com/camster offer some spots in juicyads marketplace 300x250 wow . right now each are sold for 1000 $ per week . tho you can outbid if need it soon but it's not available feature for new account under 100 feedback , otherwise you have to wait till the zone is released with one green apple .
https://manage.juicyads.com/ref2.php?ref=37517
manage.juicyads.com/juicysites.php?id=195163
either way you need to login or register to access bidding/buying via MP
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like any other cam site they are against advertisers from same niche but they did change the rules to get potential buyers.