As one of its daily deals, Amazon offers Prime members the First Aid Only 299-Piece First Aid Kit for $12.80 with free shipping. (Non-members can check out via Subscribe & Save to bag free shipping.) That's tied with our mention from yesterday and the lowest price we could find by $2 (outside of the seller below). The kit measures approximately 9.3" x 7.5" x 2.9" and includes medicine, antiseptics, bandages, and injury treatments.

Note: If checking out with Subscribe & Save, be sure to cancel your subscription after your order arrives to avoid being billed for subsequent shipments. A close price, Home Depot charge $13.18 with in-store pickup.