AFA contains items that are shipped and directly sold by Amazon. This means that AFA brands are often name brands you would find in retail stores, but not always. The ETV for AFA items is often lower than the retail price.
AI contains items that are only shipped by Amazon, not sold by them. The items are sold by third-party vendors or brands. These will often be vendors you have never heard of, but there are occasionally some well-known brands that sell their products themselves on Amazon and so their Vine listings will appear in AI.
You may also want to know that:
→ Baby products are often $0 ETV in AI, but not in AFA
→ Pet supplies are often $0 ETV in AFA, but not in AI
→ Personal care, health, and food products are usually $0 ETV in both sections
→ Books are always $1 in AFA, but not in AI