I'd vote for getting a disposable laptop with good enough hardware to do most sysadmin things. A 2006/7/8 macbook isn't a bad choice IMO since it has all the standard ports. It supports two disk drives and the keyboard works OK.
If you poke around you can usually get one in the $20-40 range. No USB-C or large processing power, but if you're mostly networking into other computers it shouldn't really be a bottleneck, right?
If you poke around you can usually get one in the $20-40 range. No USB-C or large processing power, but if you're mostly networking into other computers it shouldn't really be a bottleneck, right?