Depending on how much they charge to replace spokes it might be more cost effective to have the LBS rebuild the wheel or replace it.

That's what I did a few months ago. A single spoke broke at the hub on the sprocket side and the single wall Alex rim seemed unusually warped -- and I had to ride it 5 miles home in that condition, although I rode very carefully. Most shops in my area would charge $20 for a spoke repair, although it would have cost about the same to replace one or a few in a single session. But I figured the spokes would keep popping and nickel and dime me until it wasn't cost effective. After chatting with the manager I decided to have them order and install a new double wall rim wheel with heavier gauge spokes. Nothing fancy, just a decent Weinmann rim. No regrets. Probably last the rest of this bike's normal life.