27 from Amazon, 12 of which were < $2.00. 18 from Fictionwise. Oops -- forgot to count the ones I bought from Baen's Webscription site. I think that now pushes me over from the 25-50 into the 50-100 category.
I tell myself that I'm just like a squirrel -- storing up nuts for the winter. I figure that if I ever have to live on a reduced income, I won't have to worry about having good books to read.
I'm not worried about it too much, though. I've read 58 books so far this year, 25 of which were electronic books. Last year, I read 140 books, 55 of which were electronic books.