Advertise in your local parenting magazines and community newspapers
Drop off sale flyers with area daycare centers, many times they will put them in the kids cubbies.
Email marketing! We recommend VerticalResponse for easy mailing list management, high delivery rates, and full compliance with current SPAM laws.
Be sure to hand out business cards to everyone you meet. Every time you talk about your sale, have a card handy. Any time you need to give someone your contact information, whether it's a potential consignor or just arranging a play-date for the kids - give them your card. Get 250 free from VistaPrint.