Pupusas are delicious. I had some from a place called Los CoCo's which is on Alvarado right next to Jord's house. Each bean and cheese food disc only costs $1.60 and they are served with a delightful salad/slaw and a red sauce.
The food to dollar ratio is great. I wish the place was open past 10pm because they would make a great late night treat.
This is my fourth run in with this food since moving to L.A. The best I've had so far were at the Pupusa stand at the Silver Lake farmer's market.