Puzzles and board games. What's funny is that for me it's seasonal. I do all right most of the year but come September, I go a little nuts. I finally figured out that I'm like a deranged squirrel, hoarding my entertainment nuts for the winter. Come spring, all buying pretty much stops.
And while I borrow from the library instead of buying, books are pretty much an all-year binge. I check out and return piles of anything that seems remotely interesting.