Walmart offers the First Aid Only 299-Piece First Aid Kit, model no. FAO-442, for $11.85 with free shipping. That's tied with our mention from two weeks ago and the lowest price we could find by $10. It measures approximately 9" x 7.5" x 3" and includes medicine, antiseptics, bandages, and injury treatments.

Update: It's now sold out at Walmart; however, Amazon offers it for $11.85 with free shipping via Subscribe & Save.