Perhaps in your case rather than bulk mailing, just standard mailing would work. Throwing an address label and stamp on for 100 cards at once 3 times a year to target neighborhoods. By printing the indices on it you are not committed to mailing them. However some bulk mailers may NOT want quantities printed if they know they are not all going to be mailed - to prevent dumping a load in the mail box without paying the postage. Anyway IF you are interested in doing regular mailing campaigns of THOSE cards you ought to consider cost savings of bulk permit, vs stamps and the possibilities of it. By setting it up that way to begin with you can have one more option down the road for distribution of the cards. Good luck.