about 6 of us went through most every herb legally available over a 4 month period. all too weak and you end up with a dull head before much of a hit. even imported blue lotus flower in from thailand, sure can't understand what the big fuss is about over that one on the net.
i guess the short answer is anything that is good is probably scheduled/restricted. damiana seems to synergise well with almost anything else boosting its effect, even bad mj is a little better with damiana.
we got X10 extracts from china and they were better of course but still not really worth the hassle.
we made our own X20 tincture/extraction of damiana, passion flower and tagetes lucida (mexican tarragon) and they were all pretty ok. even managed to get a thumbs up from hardended pot heads with these three.
don't get too excited when you look at some kiwi sites, they can have a whole lot more than we can, including salvia divinorum, lucky bastards.