David Millar's Kickstarter Project
Puzzle author David Millar has started a kickstarter page for his latest project: a physical book of puzzles. He makes many mathy puzzles that I really enjoy (and often do at work while proctoring my exams.) The pledge options are very reasonable. A $5 donation gives you a PDF copy of the book and an $8 donation gives you an actual, physical copy shipped to you. He can describe things better than I can here at his kickstarter link.