Walmart offers the Sterilite 18-Gallon Storage Box 8-Pack in Gray, model no. 17318308, for $36. Choose in-store pickup to avoid the $5.97 shipping fee. That's the lowest price we could find for an 8-pack now by $16, although we saw it for $3 less in November. Each box measures 24" x 18" x 16" and features a snap-on lid.