Amazon has 2 Schwinn adult helmets currently marked down to just $13.19-$13.25.

Schwinn Codex Adult Helmet: $13.19
Schwinn Intercept Adult Micro Bicycle Helmet: $13.25

• Fully featured adult bike helmet designed for safety and comfort
• Dial Fit adjustment system for an easy, custom fit
• Easy-to-adjust webbing strap for a comfortable fit under the chin
• 10 contoured vents for enhanced air flow; heat-sealed pads to control perspiration
• Snap on/off visor for sun protection