Can you buy an M2ED without the controller?

I'm not sure but maybe you could get ahold of Kerry Garrison at Customer Service for https://www.multicopterwarehouse.com/ there's a link in the contact us for a phone number. He would know and he is also a member (KerryG) here on this forum.
Edit:
Bob Brown does know what he's talking about.

Officially no, they are only shipped as bundles with the RC etc but like Bob said, try local dealers as you never know.

We cannot order the aircraft only yet.

Hi, thanks for the inquiry. You may coordinate this situation to the enterprise dealers for further details. Please refer to the link below. Thank you for your support.

https://www.dji.com/where-to-buy/enterprise-dealers