If they were bought sexed at the feed store for around $4... they are EE. Some hatcheries are selling true Ameraucana... usually for around $18.
If you cross them to a white egg rooster... they will still lay blue eggs as the blue is dominant to white in the egg department. Maybe even more often.. if the roo is from a prolific laying breed.
If they are indeed EE and you want blue eggs from offspring... better get an Ameraucana, or maybe a CC Legbar rooster, or other blue egg only breed.
Enjoy your ladies without a rooster harassing them for now. When you get ready... be patient and find the right boy for your flock and goals... I see EE roosters free ALL the time... and I personally grow out all my boys before selecting breeders and even have Lav Am boys some times from a friends hatching eggs... All my personal Ameraucana roosters are bantam... so not a good fit as most standard size hens will point and laugh instead of squatting. Craigslist farm and garden section is good place to check when you're ready.
Good luck!