Rusty is correct. Harold Shinn of FSE has been working on a two stage target trigger for nearly a year now. He keeps claiming he is almost done and is predicting a price between $100 to $120.
The FAL trigger doesn't lend itself to target grade work. I'm not a mechanical engineer but I do know a fair amount about what makes a hammer fall and I can't figure out how it could be done. Whatever Harold is working on, he seems to be hitting snags.
There are ways to improve the pull yourself. Polish every bearing surface, including the pins. Be careful to NEVER change the engagement surfaces beyond polishing though. You can also improve things by replacing the trigger return spring with a sear spring. It takes about 2 to 3 pounds off the pull weight. This doesn't work on all lowers though. On some, it will not produce enough pressure the reset the trigger. Of my three FALs, three of them have the sear spring in place of the trigger spring. The other one has a DSA aluminum lower and it doesn't work on that one.