I used non-printed newspaper from any U-Haul store. They sell boxes of about 250 pre-cut sheets for only $10. Considering I do not have hundreds of snakes, this is a great deal for me. They are the perfect size to fold in half and fit into a 41qt tub. People with large collections who use non-printed newspaper typically get theirs from any local newspaper printing facility. The machines that print the newspapers work similarly to a receipt printer in regards to paper roll. At a certain point, the machine says the paper is out but there is a significant amount of paper remaining on the roll that the machine cannot feed through. These rolls with the remaining paper are just thrown away, so the printing facilities generally have no problem with giving them away for free. I believe it was J. Kobylka who did a video on cutting and using these rolls of unprinted paper. Just give any local newspaper a call and ask them about it!
As for the odor control.. as long as you keep up on cleaning and replacing the soiled paper there shouldn't be much of a problem. I've seen no difference and I've used aspen, paper towels, printed, and non-printed newspaper.