Ask HN: What can i buy for 50$(44€)

Hi! I need your help/ideas for the following: What can i buy for 50$(44€)? Rules are simple: If product is physical: It should be same day delivery for Europe. I like gadgets that last for a long time and keeps you interested over time. I don't like clothes or shoes. I really like things that make me more productive I like paintings I like books that tell true stories and can teach you something If digital then: If it's a game, should be downloadable for Windows(laptop with I3) or Mac OS(Mid 2008) or iOS 9(iphone 4s). >If it's a game for Mac OS then i like RPG or even better MMORPG. If it's a service, then it should be something appropriate for me(developer) like editor(Bootstrap studio) or library(Gamemaker) or service(twilo,aws) If it's music, should be electronic. If it's book, i like biographies. If charity: The org should state where my money are going(with tracking and maybe proof) I prefer charities for refugees or medical doctors Other info: Could be early access to products or AMA sessions. The item should cost closely to 50$(+- 5$) and must be paid once and last at least for a year(if applicable), not subscriptions(per month). Any ideas? ;)