Pine is cheap, but not free
In the poor mans world of the appartment pine isn't cheap enough, however the newspapers i pull outta the recycling bins are. I usualy rip them up a bit but it doens't matter much if a nest isn't needed right away cause the mice do a job on that paper like nothing i could do. I've also thought about investing in a cheap shreder. Newspaper is also great for keeping clean. I had a guinie pig once and he got lice, the vet said to use newspaper because the lice didn't like it as much. Finialy, there is no chance of the "evil" chemials from pine (just the evil chemicals from glue, but i dont' think they are that evil) Just don't use glossy paper.