Spokes almost always break at J bend by the hub, almost never anywhere else. Spoke breakage is caused by fatigue, not by a sudden impact. That's why the break unexpectedly, and why they break at the bend (because that part gets flexed the most). The fact is that your spoke breakage is likely a sign of three things: a low quality wheel build (stock wheels on a $600 bike), probably substandard parts, combined with your weight. Get the wheel trued and tensioned good when you get it repaired, but accept the fact that you may need to upgrade to a better quality wheel with a higher spoke count to avoid breaking spokes in future.
I would recommend 36 spokes in the rear at least. For rims a Velocity Chukker or NoBS. For hubs something with a steel axle, Shimano probably.
Last edited by dr_lha; 04-28-15 at 08:56 PM.