Yes, there are many peg lists available. Are you following the Dominic System or the Major System?
If the former, you can find some lists here. However, they are only from 00 to 99, which is a severe limitation of the Dominic System.
If you’re following the latter, you can find some here. Since you want a 3-digit one, you may like to see this one here as well.
There are a few websites for the Major System that can help you build those lists too (they are in no particular order):
I would recommend you to start with a 2-digit system. Trying to memorize all pegs from 000 to 999 is a lot of commitment. @TheHumanTim made a nice post about this.