Well, unless you're insane, you buy Hatch chile in bulk (by the sack full) and have the nice people you buy it from roast it (while you're waiting, someone might even treat you to the juiciest freshly sliced peach you've ever eaten).
Then, you bring it home, let it steam for a few hours (in the bag it's been transported in), peel it, rinse it, chop it up, bag it and put it in the freezer (we have a deep freezer that holds other yumminess, too, but was specifically purchased for our chile stash).
We generally buy and freeze about 100 pounds each fall, so we still need to purchase and process 2 more sacks.
The process, while a bit tiring, makes for delicious chile year round and saves us well over $150 over store bought, pre-packaged chile (which is usually pretty gross, anyway). Yay for Hatch!!!