I did some searching to find out what brands of grocery store eggs might be fertile.
Rock Island (brown eggs which hatch Red Star chicks) sold at Lucky's, Safeway, Whole Foods and many other stores. These eggs are produced in Petaluma, California.
Nutrifresh (white eggs which hatch white leghorns), sold at Trader Joe's and produced in Chino Valley, California.
There's also a TJ brand that hatches California Whites, the eggs are cream colored.
Barnstar Free Roaming Fertile Eggs, produced by NuCal, (which also produces Eggland's Best.) Sold at Raley's.
There are also local fertile brands such as Marin Sun, Lazy 69, Clark Summit, Eatwell, Sinclair Farms, Alexandre Kids, and Burroughs Farm.
Some BYCers have advised buying free-range eggs that are not labeled fertile, on the off chance that there might be roosters in such an environment.
Don't bother purchasing Vital Farms eggs with this in mind; they admit that they have no roosters.