Bonker- In my area all the store eggs are not fertile- I have gone with Health food store eggs, and with those only ones listed as local. And check dates. most have been washed and fridged, so that is a draw back.
Glover street market has rainbow fertile eggs ( Patterson? from Bryan road in winthrop.)
Then there is Texas Creek eggs from Carlton, and Torres I think out of Pateros.
There are brands in the grocery stores that are not fertile, so don't waste your time, Naturally nested, Wilcox, there is another brand that looks and claims natrural but it is just albertson brand under some organic label.