The clubs get a listing of players' home addresses from SCYSA. The clubs then send out the cards to the people in the list, this is normal process allowed by SCYSA. Other contact is prohibited if the state cup for that age group has not been played.
How do you get around it??? indirectly

Guest playing at tournaments, training with team from other club, ODP (yes ODP), parental contact and finally my favorite "I got your number from someone who said you were interested in learning more about our club" even though that never happened.