Btw from my recollection i farmed a lot of Briarthorn in SM as part of the leveling process, have some still in the guild bank for future leveling due to it not always being available on the AH.
Something I often think of with gathering is that if there is enough of the mats on the AH, it is sometimes best to farm another mat that might be easier to farm and then sell the mat that is easy to farm and buy the other mat from the AH.