Newegg offers the LG Cam Plus for LG G5 Smartphone for $7.99 plus $1.99 for shipping. Outside of the deal below, that's the lowest price we could find by $4. This module attaches to the G5 smartphone and provides a camera grip, camera controls, and additional 1,200mAh battery.
Don't mind picking it up? With stock limited by ZIP code, Fry's offers it for $9.29 with in-store pickup.