DriveThruRPG's annual GM's sale is going on right now.
I'm debating picking up some sale items that are on my wish list, like getting an electronic scan of the various OD&D books:
Or ones I don't have:
Or filling in my module collection with a couple I'm missing, like:
And just splurge-tastic things like
It's a really good deal, especially if there are AD&D modules you don't own but want to (or want to also have in PDF, like this one for me), 1st and original edition D&D books, or Judges Guild books. Sadly the GURPS books aren't on sale. Maybe next year.