Yea those herbs r usually high priced.
i dont know how but mana thisle is extremely cheap on my server.
Nightmare Vine is the most expensive herb on my server and it's reletively easy to get. i found quite a few places around the black temple in the BE and orc areas. Also found some in the netherwing place, beside the scryers flight path.
If u find anymore good places, can u plz tell me? thx
Same thing for teracone. I can never find any =P

I just got Herbalism(got to 123) today and when i went to the AH to sell the herbs i got I found that Briarthorn was like 6 gold a stack and swiftthistly almost 7 gold. however all the other low lv herbs arent even worth a gold a stack