I counted up just the books I have ready to move onto my Reader, the free classics I have downloaded, the freebies from various ebook sites, etc. Most of my books were free or less than $10.
Estimating and average of $5 a book (low average, just to be on the conservative side) I have saved about $450 in the past year. The Reader definitely paid for itself, and any accessories I could want.
Hmmm... now that I know I've save $450, what can I spend that money on?