My favorite is old books. I love that smell of a used book store with lots of old books.
Often I run into people who are like "how do you afford to buy old books" It's been a rare
case when I've bought an expensive book. Usually I get them cheap or free. Library sales
and thrift stores are always good places to get inexpensive used books. Library sales have
better selection but you often gotta compete with other people. Thrift stores are the cheapest
but the selection sucks, you can find something good though.
But free is the best! I've gotten some of my favorite books for free.
There has been many a time I've seen boxes of books on someones front yard with a free sign.
One particular book comes to mind, once at a mom & pop plant nursery, I came across a table
that they had in a shed. On it was about a dozen books and a bunch of gardening info handouts,
and a sign that said free. So I took a couple books and then bought for dirt cheap a flat of mixed
heirloom tomato plants nobody seemed to want. That book was an old copy of:
Tree Crops, A Permanent Agriculture by J. Russel Smith.
To this day it is one of my favorite books.
You just never know what you'll come across!