The new, cheaper, MacBook Air includes ~35% slower SSD compared to 2018 model - 9to5Mac
Amazon.com: Apple MacBook Air 13.3-inch Retina Display - Intel Core i5 1.6GHz, 16GB RAM, 512GB SSD - Space Gray (Renewed) : Electronics
Apple MacBook Air with Apple M1 Chip (13-inch, 8GB RAM, 256GB SSD Storage) - Silver (Latest Model) - Walmart.com
New 1.8 Inch Sata Lif 128gb Ssd For Macbook Air A1304 Mc233 Mc234 Replace Hs12uhe - Harddisk & Boxs - AliExpress
CPU vs. RAM vs. SSD: Which Mac upgrades should you get? | iMore
2020 Apple Macbook Air with 1.1 GHz Intel Core i5 (13.3-inch, 8GB RAM, 256GB SSD Storage) - Gold (Renewed) : Electronics
My 2012 MacBook Air (with SSD) is still running as good as it did when it was new. It's really amazing that a computer that is eight years old runs so well.
How To: Replace the SSD in your MacBook Air 13" (Early 2015) - YouTube
MacBook Air 13" Early 2015 SSD Replacement - iFixit Repair Guide