While I am on the subject of prepared foods. A few others I like are:
Thai Kitchen: Make sure you check to see what other ingredients may be needed because meals are not always complete. And this site is annoying. An applet that makes it load slow.
Taste of Thai: Buy a t-shirt, help an elephant.
Amy's Kitchen: All veggie, all the time.
The trouble with prepared foods is that they are often really high in sodium. Amy's Kitchen is better than the Thai choices on that account.