Mine just kinda falls into my lap with no particular rhyme or reason. My las batch was an industrial bag filled with like 40-50 pounds of antler from my mother-in-law's friend.
i got mine from a customer that hunts but the antler i've gotten so far were sheds found on his dads property. but just spoke to him last week and he talked to the guy that cuts up their meat and he is going to collect any antler that his customer's don't want.
I have an Uncle who lives in the big bend area of Texas. He periodical sends his wetb......illegals that work for him out into the desert to collect drops from both axis deer and whitetail. He loads them on a pallate and ships them by truck to me.
If you would like for me to get you introduced to him perhaps he will cut you some slack and ship some to you?