Kmart takes up to 80% offkids' clearance apparel, with prices starting from $1.49. Shipping starts at $4.99. (In-store pickup may be available. Orders of $50 or more also qualify for free shipping.) Note that sizes and stock may be limited. A couple best bets:
Designed 2B Sweet via Rakuten Shopping offers these Girls' Dress-Up Tutu Skirts in 16 styles (Yellow pictured) for $7.99 with free shipping. That's the lowest total price we could find by $5. Most tutus are suitable for children aged two to eight and feature a 12 to 24" elastic waistband.