Halfdeck there is no such filter to do what your asking. You will just have to search each link and find out if they are a link list or not.
Also who says that you have to stop at free sites. Use those niche tgps as well and get your galleries listed at the tgps. Then direct them to either your sponsor, full page ad, or your free site. Its up to you but its still targeted traffic.
Good Luck
JoeBlack