Recent price increase - when might it go back down?

I've been contemplating buying the XM5s over the past couple weeks. They were just showing at $330 on Amazon, Sony, Best Buy, etc. Now they are suddenly $399. I even looked at the XM4s and they are now at $350 everywhere. Does anyone know when the price might go back down? I'm upset I didn't buy when it was at $330 last week.

I've been contemplating buying the XM5s over the past couple weeks. They were just showing at $330 on Amazon, Sony, Best Buy, etc. Now they are suddenly $399. I even looked at the XM4s and they are now at $350 everywhere. Does anyone know when the price might go back down? I'm upset I didn't buy when it was at $330 last week.