Jen:
Whoever sold you your first hives or packages should be able to supply with a queen, or tell you someone near you that could provide you with a queen. Try to find a queen from stock in your area. In general, the sooner the queen is released the better. I pay 27 bucks for a mated, marked queen and she is delivered to my local post office over night. My queens are raised about 200 miles from my ranch.