Light Duty GX Pump
GX Pump CS1-I
4,500 PSI max · Fan-cooled
12V120V220V Auto-stop
Compact fan-cooled 4500 PSI unit with a built-in power adapter. Runs on 12V, 110V or 220V. Made for filling airguns directly.
Compressors / By Power
220 Volt PCP Compressors
Dryer-outlet power. Usually the bigger, shop-grade machines.
3 compressors
Narrow it down further → Light Duty 
Light Duty GOYOJO
GOYOJO 4500 PSI Portable
4,500 PSI max · Fan-cooled
12V120V220V Auto-stop
Amazon's best-selling budget PCP compressor. 4500 PSI, auto-stop, built-in transformer, runs on 12V or 115V/230V. Under $200.
Light Duty VEVOR
VEVOR 350W Manual-Stop, Dual Fan
4,500 PSI max · Fan-cooled (dual fans)
12V120V220V Manual stop
VEVOR's original portable: 350W, dual fans, analog gauges, 12V with an external 110V/220V converter. Manual shutoff, no separator.