USPS sells their own direct mail service [0]. The carrier has a stack of fliers or cards or whatever it is you ordered and they just put one in each box. Pretty

USPS sells their own direct mail service [0]. The carrier has a stack of fliers or cards or whatever it is you ordered and they just put one in each box. Pretty sure you can target down certain neighborhoods. I think they also offer printing for complete full service. [0] https://www.usps.com/business/every-door-direct-mail.htm https://www.usps.com/business/every-door-direct-mail.htm