You can buy NAC 1000mg on Amazon
Wrong.
Post that Amazon link, please.
Oh- I bought “NOW Supplements, NAC (N-Acetyl-Cysteine) 1,000 mg, 120 Tablets” on Amazon and it is no longer available.
But available at Walmart.com:
https://www.walmart.com/ip/NOW-Supplements-NAC-N-Acetyl-Cysteine-1-000-mg-Free-Radical-Protection-120-Tablets/49551962