This is a real easy way to get your matierials sold from the AH, all you have to do is put get the mats with your first proffession (such as skinning) then put your Buyout lower that anyone elses in AH then, use your other proffesion (such as leatherworking) and on the trade channel "WTS such and such free with your mats". It wouldnt really be free because once they get teh mats its pretty much paying you.Hope this helps someone.
It helped me today because someone wanted two +15 agility to their weapons and i told them "Your mats and its yours free" they said "okie one sec lemme get them please" so they bought out all my mats and then tipped me 20g for each of em.
This is good for people who need money fast