Is it possible to buy 'ethical fur'? I enjoy crafting leather armour. As part of an Orc design I am going for, I would like to buy some animal fur to complete the brutish/primal look. I have bought several faux furs off ebay, but they either look incredibly cheap, or they "shed" a lot of hair. So I turned to authentic animal furs, which definitely look much better. 

I decided to google around and see whether some furs are the byproduct of keeping an animal for other purposes such as consumption- i.e. I am trying not to support any farms that hold animals just for pelts. A lot of the furs on ebay are rabbit fur. In some of the item descriptions, the sellers explain what the rabbits are kept for and it seems harmless to buy some.

But I remain unsure of the practice of selling fur and whether it might be unfairly demonised (and is actually not that bad), or whether there is no such thing as "ethical fur". So I relay that question to other crafts(wo)men that may have used fur in the past or have some more experience with it.
Rework an antique fur coat!

My grandmother keeps encouraging me to take hers, which I really don't want -- but the point is there may be many other such coats that used to be valued and sought after, but are now of very little interest to most potential wearers. Asking around thrift stores or estate sale agents may give some leads; even if they would typically discard such items due to probable disinterest, letting them know you're interested means they could inform you next time an old coat is available.

If it's significantly damaged (moths, mold, just old age), all the better: it is unlikely to have any further use as a coat, but could readily be repurposed into accents on a costume. This is perhaps the most ethical use of all: you're not resulting in any new animals dying (even if humanely raised and slaughtered), but instead salvaging something that would otherwise end up in a landfill.

(But like anything ethical, it's sort of down to your personal perspective and comfort level. There's also an argument to be made that if it wasn't humane and ethical in the first place, it isn't now just because decades passed between the animal's demise and your use of its pelt.)