When i print bits out i need, i just use the work laser, can't get cheaper than that can you?You need a laser printer for the lowest cost per page. I have a low cost Samsung wireless color laser. It does duplex in a manual fashion, which is not that much of a PIA. I printed some rather large manuals 2-UP and duplex. I do wear reading glasses and 2-UP are readable for me if in decent light.
I also did the duplex printing style, print out odd numbers, flip the stack of paper over then print out even numbers. Works just fine, saves a few tree branches, just takes a little longer.