Please say what area you are selling eggs in. I am in the Portland Oregon area. Duck eggs sell for a low of $4 a dozen to a high of $4 for 4 eggs (yea, $1 an egg!) The average price is $5 a dozen. When I was in Burlington VT, I was told at a farmer's market that duck eggs were difficult to sell; the vendor "couldn't give them away". Hard to believe! I am always encouraging people to try new things, like duck eggs, at the farmer's markets. I even hand out little informational cards to those who express any interest or curiosity. Feel free to copy the following and pass it on:
"Duck eggs contain twice as much potassium and vitamin A, 3x as much iron and 5x as much vitamin B12 as chicken eggs. They also are higher in these nutrients: protein, calcium, magnesium, phosphorus, zinc, copper, manganese, selenium, thiamine, niacin, Vitamin B6, folate, and retinol. They contain twice the amount of monounsaturated fatty acids which lower total cholesterol and LDL cholesterol (the bad cholesterol) while increasing HDL cholesterol (the good cholesterol) . Their cholesterol content is approximately 2x that of chicken eggs. They have more albumin (protein) which gives them more structure - more fluffiness in baking. Free range eggs have significantly higher vitamins and Omega 3 fatty acids while less fat and cholesterol. Reportedly, most people who are allergic to chicken eggs are able to eat duck eggs without allergic reactions. "
infor per: local harvest.org; buzzle.com; itdfarm.com; 101sweetpastry.com; Wikipedia.org; newagrarian.com