Several registrars have reduced prices for .NET registration:
https://tldes.com/net
There will probably be even more such registrars in the near future.
The Solopreneur Sale at Namecheap (March 12 – 18, 2024)
There are discounts on registration and transfer. More details on the Namecheap website:
https://www.namecheap.com/promos/solopreneur-sale/