Good for you, Paul. And Charlie.
I can't match this on quantity or cheapness, but I made a similarly justifiable purchase yesterday,
The Road to Ithaca by Ben Pastor, the latest in the Martin Bora series. It had been on my wishlist since before its release and yesterday the price dropped to $2.99 at Amazon. I also used credit. No guilt here, either, even though I'd hoped to get through June without a purchase.