פירוש על עבודה זרה 84:11

If one finds a utensil that has on it a picture of the sun, moon or a dragon he must destroy it, since it was certainly used for idolatrous purposes. According to the first opinion, the best way to totally destroy an idol is to throw it into the Dead Sea. In such a way there is no chance that he, or any other Jew, will ever derive any benefit from it.
Rabban Shimon ben Gamaliel states that not all utensils that have pictures of the sun, moon or dragon are forbidden. Only precious utensils with such pictures on them are forbidden, for they were certainly worshipped. Cheap utensils were, in all likelihood, not worshipped, and are therefore permitted, even though they have on them pictures of the sun, moon or dragon.