Ambush Alley has a discount available on Osprey books for its SOG members.
From their announcement:
As part of our ongoing partnership, Osprey Publishing is offering SOG members a special discount on Osprey products. Simply enter the Osprey discount code when submitting your order to receive a 15% discount on your purchase. Note that this 15% discount is in addition to any other discount or sale that Osprey may have in place for that product. That can add up to some big savings.
SOG members will, of course, continue to enjoy their 15% discount on all AAG published materials as well as the many discounts offered by supporting vendors such as QRF, Rebel Minis, S&S, etc.
If you’ve been thinking about joining SOG, now is a good time. Heck, this is a pretty good deal even if you’re not that interested in AAG products.