You don't need a HoloLens Development Edition to write HoloLens applications. Any HoloLens 2 will do - the physical devices are the same. See the HoloLens 2 Development Edition FAQ for more information.
If you need more help with sales or devices please see the support options at https://learn.microsoft.com/hololens . The hololens-development tag is specifically for technical development questions.