Earlier in the year, I was given a free "non-working" MacBook Air 13" mid-2013 (MacBookAir6,2) which had a dead battery, a missing SSD, no power supply and was missing it's bottom case screws. My friend who gave me the laptop knew I enjoyed bringing older Macs back to life, so I was happy to accept the challenge!
I started by buying a cheap ($3 AUD) "NGFF M.2 NVME SSD Adapter Card for Upgrade MacBook Air(2013-2016 Year) and MF6A5" adapter via eBay (it was the short stub style adapter with the letters BZHS on the back) to go with a 256GB "KingSpec M.2 ssd M2 240gb PCIe NVME Solid State Drive 2280" which was about $65 AUD.
After finding this thread I took the same route and opted to buy a $17 (AUD)
The NVMe SSD is recognized by System Profiler with a Link Width of x4 and a Link Speed of 5.0GT as expected. Macs Fan Control shows the KingSpec SSD running cool around 40°C. I have not seen the SSD temperatures rise above 50°C even during post-installation indexing and benchmarking.
Because most of my Macs are quite a bit older, I also didn't have access to a MagSafe 2 power adapter (and didn't want to pay $20 or so for a little MagSafe 1 > 2 converter which will likely go missing). So I bought a MagSafe 2 cable (only) for about $5 AUD. After carefully cracking open an existing 60W MagSafe 1 power supply (of which I have many) I desoldered the original cable, soldered on the replacement and re-sealed the plastic housing seams using the soldering iron tip. Instant Magsafe 2 on the cheap!
I've now ordered a replacement 55Wh 7.6V non-geniune battery from an interstate supplier for $65 AUD (inc shipping) to bring it back to it's portable glory. This should arrive during the week.
So to add it all up, the grand total to fully restore this old MacBook Air (which is surprisingly in good physical condition) is $157 AUD or about $112 USD at today's conversion rate.
Not bad for a little Mac which can run Catalina and Xcode 12, is surprisingly snappy with the new SSD and looks to be fully supported in the coming GM release of macOS Big Sur!
Not to mention, the MBA keyboard is much nicer to type on than my 2018 13" MacBook Pro with Touch Bar - it even has a physical escape key!

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