Target offers the Mossimo Junior Girls' Scoop Tee in four colors (Neon Pink pictured) for $4.50. Opt for in-store pickup to dodge to the $4 shipping charge. That's $5 off list and the lowest price we could find. It's available in sizes XS to XXL, although not in all size/color combinations.
Hollister offers its Hollister Girls' 2-Tier Printed Cami in four colors (Blue Pattern pictured) for $14 plus $7 for shipping. That's $16 off list and the lowest total price we could find. It's available in sizes XS to L.