15e is prob tops for first one, doubt you'll get more than that.
I'm not really sure about the demon shield, I think hype has gone down and it's not a very popular skin for demons shields because of the greens I guess. 50e+ should be possible, but I'm not really into demons shields so could be wrong.
I had the same stats and skin as the demon shield, but in q11 Tactics. I sold it for ~75e, I believe, and it took me about a month. Take from that what you will.