Amazon offers Prime members the Aden + Anais Classic Muslin Swaddle Blanket 4-Pack in Mod About Baby for $33.44 with free shipping. (Non-Prime members can spend $35 or more to qualify for free shipping; otherwise, shipping adds $6.01.) That's the lowest total price we could find by $2, although most stores charge around $50 per set. These blankets measure 47" x 47" and are made of 100% cotton muslin.