Lol, I pay a little cause I don't normally subscribe and I prefer clean paper that I get at uhaul, but I'd still think that's cheaper than buying the corrugated.
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Try calling some local newspaper companies. After printing they throw away their spent/end rolls and many of these have a great deal of blank paper left on them. Ask nicely and they'll often give you a time frame in which you can come pickup as many end rolls as you like for free.
Just switched to cageliners bulk roll a couple months ago and I'll never use anything else. Order by width and cut to length. I think it helps with humidity compared to newspaper also. I've not had to mist at all like i did with newspaper and humidity stays around 63 percent.