You can buy plastic drone foundation, plastic drone frames (Pierco) and wax drone foundation (from Brushy Mt. and Dadant). You can also just put empty frames in a hive that has only worker foundation and they will usually draw it as drone from early spring until late summer. Or just put a shallow or medium frame in a deep box (if you use deep boxes). The will usually draw some drone on the bottom. The reason is that using only worker foundation leaves the bees wanting desperately to build some drone comb. If you use the medium frame in a deep box, you can just cut the drones off the bottom of the frame and put it back. If you use the empty frames or drone foundation, you can freeze or you can just pull them all out with an uncapping fork and feed the larvae to the chickens.