i,m resurrecting this thread as i,m also doing an ethical penetration course and have the same issue. Battling to find an adaptor?
If you think you need a Monitor mode network card to achieve your education goals then you are in the wrong mindset to become good at this profession.
Yes, you need monitor mode to use and practice the various tools that are used, but don't get stuck in a rut.
If you cant get an atheros, then what about realtek? D-link? Broadcom? TP-link?
What about devices with the chipset that are not network cards. Don't get tunnel vision and focus on network adapters only.
There are options.
Make a plan
Try harder.

