A/C leak in 2000 model

Hey guys,
got an AC leak somewhere in my 2000. I have added R134 but it doesnt last long, do you guys know a common place to look for AC leaks or anything I can use to find it?
The compressor seems to work fine when I add refrigerant.....

take it in and get a pressure check done. they can see how big the leak is. if it isnt big, then just throw in some AC Stop leak and hopefully that'll help.

I was trying to sort of DIY.....is not a small leak because I have already added stop leak and no luck.
I thought they used to sell something to help you find AC leaks?

you need someone with leak detecter if it leaks enough you should see oil coming out of freon some where or better yet go to a shop get est.good luck.