Some manufacturers do list directly on Amazon. If it's a huge discount I've done this but double check the seller. In general, I'll just use backcountry.com or REI though since I don't have to worry about a fake.
I ordered from BackCountry and loved the gloves just as much as I always had. I don't know if the Amazon listing had truly been hijacked by a counterfeit, but I'm glad I didn't risk it and I tend to try to go to other sites first now.