So my friend had a perfect condition Galaxy S2 that he wanted to sell for $200 (this is after the S4 came out). You can probably get one for like $175-200 on eBay. Seeing that he was in need of money, I bought from him for $200 (good friend). I posted the phone about two days ago for $250 on Craigslist. I had a few people contacting me. Today I sold it for $240.. I was really hesitant about knocking down the price, but this guy from very persistant (trust me! I usually won't budge). But in the end, I helped a friend out and made an easy $40.
Paid $200 for S2.
Sold for $240.
Profit = $40
