Where to buy flight sticks and controllers — these stores have stock

Thrustmaster T.16000 FCS Flight Stick: $69 @ B&H Photo (opens in new tab)
The Thrustmaster T.16000 FCS Flight Stick offers 4 independent axes and 16 buttons. The fully ambidextrous joystick also has an ergonomic trigger and a weighted base to keep it from sliding around your desk. 

ThrustMaster T.Flight Hotas 4: $69 @ Amazon (opens in new tab)
Built for the PS4 and PC, the ThrustMaster T.Flight Hotas 4 is one of the least-expensive flight controllers you'll find. It's ergonomically designed to adapt to all types of flights and it comes with a detachable throttle and dual rudder system. Best Buy has it for $79.99 (opens in new tab).

Logitech X52 H.O.T.A.S Throttle and Stick: $149 & B&H Photo (opens in new tab)
The Logitech X52 H.O.T.A.S Throttle and Stick Simulation Controller is completely sold out at Amazon. However, B&H Photo offers  the standard and professional models. Both are designed to provide a realistic flying experience with your favorite flight sims. 

Logitech G PRO Flight Yoke System: $169 @ B&H Photo (opens in new tab)
The Logitech G PRO Flight Yoke System brings professional flight controls to your desktop. The yoke system has five total axes and integrates with a full lone of modular Logitech G flight panels and devices. You can arrange them stacked or side-by-side to create your own professional custom cockpit.

Thrustmaster TCA Quadrant Airbus Edition: $99 @ Amazon (opens in new tab)
The Thrustmaster TCA Quadrant Airbus Edition is officially licensed by Airbus. It offers the look and feel of the Airbus flight quadrant. It will debut on November 24, but you can get your preoder it now at Amazon.