I can help you out if you like. I made a similar sized coin for myself when I first joined shapeways.
My camera doesn't take the greatest close up pictures, but I really like how it turned out. I ordered the coin with the bronze finish and was really impressed with the level of detail. My coin has a 40mm diameter and has an average thickness of 3mm, though some raised areas are thicker. The cost for shapeways to make it was about $28.00. Since cost is based on volume, fairly minor changes in thickness or diameter can make a big difference in the final volume and price.