Also keep an eye on Purplus software.

They buy SM in bulk and sometimes have awesome sales at Christmas.

I've bought from there a lot (Got Manga Studio 4EX,  Anime Studio and Poser 8 from them) all Boxed Smith Micro versions. (I recently upgraded on the last SM sale and went with Poser10) so buying Poser 8 at the time really helped.

 

Tho its mailed out,  so you'll wait a few weeks for the box to arrive. But the deals are usually worth it. I bought a fair bit of software from them over the years and I havent had a problem (Based in California, so if you're near there you could just pick it up from the warehouse).

Carrara 7 Pro, Anime Studio Pro 8, Hexagon 2.5, Zbrush 4.6, trueSpace 7.6, and Corel Draw X3. Manga Studio 4EX, Open Canvas 5, WACOM Cintiq 12WX User