If $209.50 is for non-stop flights, I would definitely buy now. I seriously doubt you will get a better fare for non-stop flights if you wait. I think the chances are greater that the fare will be higher.
As to refunding the difference if the fare lowers, the lower fare must be available on your exact itinerary, not just the route in general, and no, they will not refund the money, only a voucher for future use on that airline, good for one year.