I don't know of any that provide affiliate tracking for tangibles. IN fact if unless you have your own merchant account, many won't do third party billing if the tangibles are adult related.
They'll provide the interface but not the actual processing. IN order for third party billing to offer processing via their merchant account, they in essence become a partner. It's a loop around factoring which is illegal.
Check all the fine print of whomever you open with.
If you have your own merchant account it would be more cost effective to open your own cart, plug-in autorize.net and add an affiliate program such as Comission Junction or purchase one and do your own accounting.
We offer simple, yet affordable scripts.
Dianna Vesta
www.nichecartel.com