Are you looking for affiliate programs that allow you to private label or power affiliates that run private label programs?
We run several private label programs in multiple verticals. In each case, the program is available through some network or the merchant somehow supports affiliates.
We do this for several reasons - avoid Google's bridge page issue, so we can control and test creative, capture tracking data, and most importantly so we ensure we get paid for each sale. (25% or more of your leads may not be credited to you!)