Hello,

Put my AC condenser in couple of weeks ago, want to go get the system charged but when assembling it I put the old O-rings on and only snugged the fittings for now.

Does anyone know where I can get o-ring, would a garage that will recharge already have them, advanced or western auto, or do I need to look elsewhere.

Thanks for the help, want to get the AC up and running so I can drive the car more with the baby.

Any parts store will have them. Just take the old ones in and match them up.
If the system has been down for a while you should really replace the accumulator. It's also a great time to replace ALL of the old o-rings in the fittings, it's maybe $5 and cheap easy insurance against leaks.