Books are on sale at Desiring God today and tomorrow for $5.
Not sure if it includes their bibles, but it does seem to include all the biographies, and his treatise on Romans 9.
(Note: it looks like word is out, though, because the website is slower than molasses in January. I guess I'll have to do my shopping later on this evening.)
Now, I wonder how fast I can finish the report I'm working on now to pay for all this good stuff...