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Buy underpriced used books. Outfit a phone with an ISBN reading app, scan the ISBN numbers of books at used bookstores and thrift shops, and compare the asking prices with what the books are selling for on a site like Amazon. Whenever you get a good hit (which won’t be often but, since the process is fast, won’t take long, either), buy the book and resell it online. Be discreet about this, as the store managers probably won’t like what you’re doing.
If you live near a university, there are likely all sorts of research studies looking for participants. While I was an undergrad at Virginia Tech, I got paid $500 to participate in a 6-week dietary study. The study provided all my meals and paid me, but I had to eat a 5,000 calorie diet of 50% fat for 6 weeks, plus I had multiple muscle biopsies, urine/blood testing, etc.
Getting a raise is an excellent move because it doesn’t require you to trade more time for more money. You are putting in the same amount of time, but pulling a bigger paycheck. But, it’s always a bit tricky to ask for a raise when your company already has you at your current salary. You’ve got to make a strong argument you deserve the increase. Here are the top 10 mistakes to avoid when asking for a raise. 
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