Amazon.com: for PS2 Joystick Breakout Module Game Controller Replacement Dual-axis Joystick Analog Thumb Stick Gamepad Lever Sensor for Raspberry Pi, 5Pcs : Video Games
Analog 2-axis Thumb Joystick with Select Button + Breakout Board : ID 512 : $5.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Pmod JSTK2: Two-axis Joystick - Digilent
Analog 2-Axis Joystick
2-Axis Joystick - Parallax
2-Axis Joystick : ID 245 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits
In-Depth: How 2-Axis Joystick Works? Interface with Arduino & Processing
Joystick Breakout Module XY Dual-Axis Game Controller - Walmart.com