alt Hacker NewsAn old PC ATX power supply is great for most things that use 5/12V. You get the 2 most common voltages for network gear, with plenty of capacity and efficiency (with a decent PSU.)
You do have to solder, though I wouldn't be surprised if one can find sata power to barrel adapters on AliExpress.
They make breakout boards that mate with the main ATX motherboard connector on the PSU. Bonus that some of them even include fuses.
And at that point, why not just chop up an old ATX case to house everything, assuming there's clearance.