Oh yeah, there's also scratch discount tickets if you happened to get the Coast Guard Exchange fliers. You can use the discount on this as well. It starts at 5% off and works up to 25% I believe.
Also, if you need gas, fill up your tank with at least $25 and you get $5 off $50 when you show...
I'm not sure if this is a national thing or not, but at the Oceana NEX in Virginia Beach, VA they had a pile of them available at retail price. No bundle or anything else needed and it is tax-free. The only limitation was that it's one console per military ID card.
They also had plenty of PS3...
The link for the 12 month card at Amazon is bad in the first post (it hasn't changed price though).
Should point to http://www.amazon.com/Xbox-360-Month-Live-Gold-Card/dp/B0029LJIFG/ref=cheapassgam08-20