For anyone interested in an inexpensive reference catalog using Scott catalog numbers, here's a bargain closeout just announced at only $5. That's $21.95 off of the typical list price of $26.95, or more than 81% off its normal retail price.
http://whitman.com/Inventory/Browse.../keyword/BNAI realize this is last year's edition (2011) and the stamp values are typically inflated over that shown in a typical Scott catalog, but you do have color photos, and the added sections of Canada and UN stamps included for a bargain basement price.
All in all, not a bad reference catalog for the price.