I have a question about replacing wheels.

My front wheel has spokes that come loose once in a while, and it seems like they vibrate loose. Re-tensioning them works for a while, but they will come loose again. The rear wheel does this too, but not as often, but I recently had a spoke break on them.

Is it better just to replace both wheels? Replace only the front? I'd like to keep it under $275.

If i'm going to spend money on the wheels on my bike now, id probably spend less than $15, because any more and its just taking out of the new wheel fund.

If I do get new wheels, any reccomondations? Price is kind of an issue, but taking public transportation daily would cost more than the parts anyways.