I would de-tension the entire wheel, check that the rim is not bent, install the new spoke, and re-tension the whole wheel. If you're getting the wheel back right away, the LBS is not doing this. Maybe suggest it to them, or do it yourself if you can. If you can't do that yourself, there's no time like the present to learn! If you pop another spoke after that, I would go to a stronger wheel with more spokes. Personally, at 190 myself, I don't like riding less than 28 spoke wheels.