SBI! normally runs specials around the major U.S. Holidays but they are never as good as the buy-1-get-1-free Christmas. The others are usually if you pay an extra $100, you get 2 SBI!'s. They are good if you know someone else who wants to buy so what it means is you both can split the cost and get it for $200 the first year instead of $300. But of course the renewals for both would still be $300 after the first year and going forward.
The Action Guide is what you get when you buy SBI! and it is your blueprint for building your site and using the SBI! tools. Sort of like a step-by-step guide. You can actually view it without buying SBI! at the link below...
http://action-guide.sitesell.com
The Affiliate Masters Course is a guide to teach you how to make more as an affiliate. It is not necessarily geared toward SBI! customers. It can be used to help you promote all affiliate programs no matter the company.