Guys, how long is this offer available? I plan to register in the first week of November. Just curious to know if it would be available then.

This offer has been available for a few months. I'm not too sure when they're going to cut it. What's great about it is it can be also used if you want to buy exam vouchers. I used it to purchase 2 Practice and 1 Proctored Test for GPEN, it dropped the price down to about $749 if I recall correctly. Also do not forget about their 25% off deal until 10/26 below (Assuming you can pay early):

http://www.sans.org/online-security-training/specials.php