Goodwill on Little River and Columbia Pike (by Juke Box Diner) has a pretty good maternity section. Tues is their customer appreciation day, I think it is 20% off. Also check the dresses section. Most maternity dresses end up mixed in with the regular sizes.
The Salvation Army on Little River has an ok selection but finding stuff is hard because they organize based on color and type. Check the books here too, lots of great kids books cheap. Their customer appreciation day is Wed (25% off everything).
Also try the local Facebook groups Names Below: Kingstowne/Alexandria Baby Exchange, Alexandria Moms Buy/Sell/Trade, BABY & CHILDREN ITEMS FOR SALE IN NORTHERN VIRGINIA, Springfield, VA Virtual Yard Sale
Signed, a consignment/reselling/upcycling fanactic
