Quantity   Component name
1 × ATX power supply Mine is rated for 575 watts max, but that's probably overkill for most bench use. Pretty much any working power supply will be fine.
1 × Power resistors I didn't have the right values so rather than order anything, I just grabbed a bunch that I could find and strung them together to get the right values. Not the prettiest approach bot it worked.
1 × LED with housing and appropriate resistor for 5vdc In my case, it's a green T 1-3/4 in a metal panel mount case paired with a 330 ohm 1/4 watt resistor.
6 × Binding posts I used black for ground and red for everything else, but feel free to defy convention. Choose the quantity based on how many outputs you want; in my case, I did 'em all (+3.3vdc, +5vdc, +12vdc, -5vdc, and -12vdc).
1 × Cool on-off switch I spent a long time scrounging through switch bins at the local surplus store before I found mine. Take your time and find the right one.
6 × Crimp-on ring connectors I actually solder 'em, but that's usually what they're called. Get the yellow ones (I think they're for 12 gauge wire) as well as some smaller blue ones.
1 × Heat shrink tubing 1/8", 1/4", and a few bigger pieces if you've got 'em around.
1 × Solder and flux For some reason I stick with RoHS stuff, so I use SAC305, no-clean rosin core, in 0.020 and 0.031. The thicker stuff is good for soldering the crimp connectors. A tube of no-clean flux helps this process too.
1 × Circuit board I used a premade proto board, but you can just grab whatever fits your resistor selection and mounts ncely to the case.
1 × Misc hardware Nuts, bolts, washers, bushings, standoffs, etc. Nothing too fancy here.