Perhaps if you were to look into locations of authorized resellers
that could be where a few leads for finding new/old-stock Macs.
[Find an Apple Store -or- other retailer]
• Apple - Find Locations (sales, service, support, AASP)
https://locate.apple.com/
There are links to check in Other regions/countries; those generally
may not have an official Apple Store; just Apple authorized resellers.
• Apple - Find Locations - Location Selector (global regions/countries)
https://locate.apple.com/findlocations
For those locations, what can be found are independent businesses;
authorized to sell, & repair too: Authorized Apple Service Providers.
Smaller local Apple authorized resellers may know of New/old stock.
However models may be sold out; or available as factory refurbished.
Apple [online] Refurbished has (2) MB/Air 'Intel-based' models today.
these qualify for AppleCare+ (& also 4 - 6 'lower-end M1' MB/Air.)
(MacBook/Air Intel-mac one : And Intel-mac two (both near alike)
[Among MacBook Pro are 'Intel' -&- 'M1' upper end' refurbished
All these refurbished ones qualify for AppleCare Extended Plan.]
https://www.apple.com/shop/refurbished/mac/macbook-pro
Good luck & happy trails!
🌿🌻🌦❄️☃️🌞🙀🐶