Amazon has the First Aid Only 25-Person Contractor's Emergency First Aid Kit (178pc; 9302-25M) on sale for $19 with free shipping on $35+ or with Prime. Wall mountable.

Includes items such as adhesive fabric and plastic bandages, antibiotic ointments, BZK antiseptic towelettes, burn cream packets, gauze roll and pads, gloves, scissors, and tweezers.