Unless you go to a quasi North American grocery store like Mega or Sorianas there are a few things you will need to get used to and one of them is eggs. Typically, they are not refrigerated and this comprehensive article tells you why.
And btw, in my colonia you will usually get 13 farm fresh eggs for 20 pesos, less than 2.00 CAD. Don’t expect a paper carton, though. They will put them in a clear plastic bad and weigh them.
Always want to be prepared to make Huevos Rancheros or other tasty, cheap and filling egg dishes. Oh, and Huevos Divorcicado? Eggs with rojo y verde salsa…not touching, of course.