Depends on the shard, and how many people are selling them. I routinely get 850k for them, and pardons, on Legends. Ive seen some shards way higher, a few shards a little cheaper. I usually check a few close shards and try to figure a median price, and start with that. My dad always said, " IF it doesn't sell, you can always go down on price and sell it...But if it does sell, you cant go up on that one."
Which I always took to mean, shoot a little high, and then back off until you find what works.