US$ 23.94
cardo packtalk shoei neotec 2 GT-Air 2 Helmet Adapter for Freecom or Spirit – 3D Printed – Josh's Widgets Clean Integration aptosstylecode_239686 Color:Purple Lava TREK Bike 4 Series
TREK Bike 4 Series 4300  | eBay
Harley-Davidson® Men's Flame Spoiler Half Helmet, 98206-13VM
aptosstylecode_239686
Color:Purple Lava
Just FYI, Streamlight also makes brighter versions of this light that are USB rechargeable—but not for under $20
Clean Integration
US$ 23.94
US$ 20.62
US$ 22.52
US$ 25.15
US$ 20.88