noglider 

There is a thread called Bike Flipping 101. You may enjoy reading that.

I learned a good rule here when I was flipping bikes: have an eye for making a minimum profit of $100. Otherwise, it turns into a waste of time. Of course, you can make your own rules for yourself. Learn what things generally go for. Buy low and sell high. In other words, don't pay general market value, because you'll lose when you sell. Wait to find something whose seller undervalues.

People in the boonies generally don't expect to get much for their stuff, because their choice of buyer is narrow. It might make sense to look at the CL listings there. Then sell in hot markets, in densely populated areas. I made a road trip of buying only once. I accidentally won some ebay auctions in central CT, far from me. I made the trip worth my while by lining up deals along the way. I came home with seven bikes in my car, though I paid too much for one or two of them. I ended up selling them at my cost, but they didn't take much work, so it wasn't so bad.