You will entertain yourself for a low price.
If you’re looking for entertainment on a budget, you can’t beat books. Thanks to the popularity of electronic reading devices like the Kindle and re-selling websites like eBay, it’s never been easier to entertain yourself for hours at a time, for the low cost of a few dollars.
source: Lifehack.org. Read the entire article by Daniel Warren.
How about FREE? Use your local library, including this place.