One of my tips is to save all the free phone books left by your door. The pages can be used as fire starters, but the main reason is a page will do for emergency toilet paper. They stack, store, and carry better than TP rolls.
I have my own stock of toilet paper, but if I want to barter or share I will start with the yellow pages.
(ahem) Let your fingers do the walking?
I've been buying used hand & bath towels at yard sales for pennies. They are actually way cheaper than a box of 'rags' at Sams Club.