Shop builders and showcases have been around affiliate marketing for years, and the concept continually evolves. Lately, I’ve been playing with PopShops, which bills itself as “a new generation of affiliate tools.”
PopShops Basic is free, and then there are enhanced versions (Pro and Enterprise) for flat monthly fees.
The affiliate programs available in PopShops include those using Commission Junction, LinkShare, ShareASale and independent programs.
More details at http://www.popshops.com/.