How to make sure that the game will run on Quest 1 while developing with a Quest 2?

Hello,

Im a solo hobby / indie developer and I use my Quest 2 for development, but I also want to make sure that the game will be available for Quest 1 users.

The obvious solution would be to use a Quest 1 to test the game, but as far as I can tell it's not possible to buy a new Quest 1 anymore. Is there any other way to buy a Quest 1 for development or how do you make sure that the app will run properly (performance) on a Quest 1?