I've set my prices to match similar to those of A.D. As far as currency goes, I plan when I get a nance to implement a small area of stands (closed market ) that will be coin operated to some degree. If there was a market out there doing this like WE intended I'd try and just get a stall there.
The one thing A.D.s prices really changed was the bulb to metal ratio, which males a big difference as it is now half of what it once was. The currency itself has a strong base due to this, no one should be arguing with bulbs at that price for selling, and at least buyers are getting more.
Setting a standard there makes most of this doable as long as currencies keep a similar ratio for:
bulbs, metal, silver/gold, jewelry