Not that I'm "pushing" Amazon.com...but, a lot of his books are available there for really cheap prices.
But, I buy from LOCAL bookstores and directly from Pat's web site whenever I can.
(I'm a big fan of supporting the authors, musicians, artists, etc. directly when possible--as well as LOCAL businesses too).
For peeps who are not familiar with Pat's musings...you can likely find at least a few of his books at your local library. If you an "outdoorsy" person, you will laugh your arse off...guaranteed!