Go to Amazon and put the iPhone you’re looking for, in this example the iPhone Air, and you will see several Airs being sold in renewed premium condition.
Amazon.com: iPhone Air renewed premium unlocked
www.amazon.com
Buying a pre-owned renewed premium iPhone guarantees greater than 90% battery health, near perfect cosmetics, and 1 year window if you decide to get a full refund. In my experience getting iPhones this way, the devices I have gotten through Amazon renewed premium, were in pristine cosmetic condition and in some cases had the battery replaced giving me 100% battery health.
As for purchasing a refurbished device from Apple through their certified refurbished store, it is a hit or miss what device is available at the time from Apple. As of right now the only devices available through Apple Certified Refurbished are the iPhone 15, 15 Pro and 15 Pro Max.
Save up to 15% on a refurbished iPhone from Apple. Full 1-year warranty with a brand new battery and outer shell. Free delivery and returns.
www.apple.com
It depends on how you want to proceed however there are different series iPhones that can be perched outside Apple. You can get better deals going through Amazon than you do going through Apple with a wider choice of devices you are able to purchase, it’s your choice where you want to get your device from.