Sentence 1: I sell things on eBay, Amazon, and Craigslist. 
 Sentence 3: His girls had grown up and no longer wanted it 
 Sentence 4:  I sold it on Craigslist for $200 
 Sentence 5:  My friend was pleased to get some money 
 Option 1: The other day my friend wanted to sell his sea kayak. 
 Option 2: The other day my friend wanted to buy sea kayak.