Walmart offers the Girls' Batgirl Skirt (pictured) for $3.38. Choose in-store pickup to dodge the $5.99 shipping fee. That's $16 off and the lowest price we could find. It's available in one size fits most.Also available is the Girls' Supergirl Skirt for $5.29. Opt for in-store pickup to avoid the $5.99 shipping charge. That's $2 off and the best deal we could find. It's also available in one size fits most.