dude, if you have a blender, just make it yourself
1 can of tomatoes, whole peeled
half an onion
palmful of fresh cilantro
clove of garlic
1 whole jalepeno (this will vary depending on how hot a pepper you get or what you prefer, also try cerranos or habeneros)
BLEND
Also try pan frying the ingredients (except the canned tomatoes) together in oil before blending
- just don't chop up the pepper before frying unless you want your eyes to bleed