Explore tested websites to earn money online

Here's a super simple business that I started with $300 and 20 sheets of paper: An iPhone buy/resell business. Step 1: Post Fliers I created a really simple flier that said something like "Want to make up to $300 for 15 minutes of your time? Sell that old iPhone collecting dust in your drawer. Accepting all models and carriers. Text XXX-XXXX." I printed out 20 of them and posted them all around my alma mater's campus. Took about 5 minutes to design, and cost me about fifty cents in total. Step 2: Determine Buy Prices I wrote a bunch of code that scraped various sites and gave me pricing graphs for every carrier, model, memory capacity combination of iPhone, so I knew exactly what prices I should buy at. You can do it much more simply, though. When someone texts you, just search that item - for example "Verizon iPhone 5 64GB" - on eBay. Look at the "closed" (important!) auctions and average the 10 most recent sale prices. Offer 60%...