You didn't specify which AC unit you have, but they are all available through Walmart, Amazon and etrailer.com.
'04 K3500 Silverado LS with LS3 Connect & Cruise- with Intimidator SSI PKG- Reprogrammed 4L80E
2016 Salem 27RKSS
1984 CHEV SCOTTSDALE K20 2GCGK24J0E1XXXXXX (Chevrolet Legends-Class of 2019) "...exhaust fluid? We don't need no stinkin' exhaust fluid"