Amazon.com: HQRP 2600mAh Battery Pack Compatible with Garmin Astro System DC30 DC-30, Astro 220 320 GPS Dog Tracking System Collar Receiver 010-11049-00 : Electronics
Amazon.com: High Gain Long Range Magnetic Base Replacement Antenna Compatible with Garmin GPS Alpha 100 200 200i Astro 220 320 430, Eifagur : Electronics
CJP-Geek AC Adapter for Garmin Astro 220 320 Handheld/s GPS Receiver Power Supply Cord - Walmart.com
NON Gen AUS SD maps for Astro 220, Astro 320 Astro 430 and Alpha - from Optic Hunting Gear