I wash our eggs and weigh them on a little cheapo digital postal scale. After the eggs that we use and give to family and friends, my wife sells about 8-10 dozen brown eggs per week at her work.
Small/Medium (under 56 grams) $1.50 per doz.
Large (56-63 grams) $2.00 per doz.
XL/Jumbo (over 63...