"Penetration Testers" rejoice, here's an Alfa AWUS036ACH for sale and it's cheap.
If you're reading this you're probably already familiar with what Alfa wifi adapters are good at and used for... if not google it (kali linux alfa).
This is one of their newest and best models. It's AC1200, so it's fast. It has a max output power of 1.6watts (average home wifi is about 0.1watts). It's nice and portable, and has a ton of community support and forum information for doing all sorts of fun stuff.
do NOT contact me with unsolicited services or offers