This is the bare PCB you need to build your own 20mm FET+7135 driver!  DIY parts kit available here.

Specifications:

• Fully stable with attiny25
• 2 oz. heavy copper
• Red solder mask
• 1.2mm PCB thickness
• 20mm diameter

Parts Required:

• FET: LFPAK56 N-Channel Mosfet
• 7135:  AMC7135 Linear Regulator 
• D1:  SOD-323 / 0805 / 0603 Schottky diode
• Z1:  SOD-323 Zener Diode - 4.3v <--> 5.1v
• C1:  10uF MLC capacitor, 0603 or 0805 (X7R preferred)
• R1:  19.1K, 1% resistor, 0603 or 0805
• R2:  4.7K, 1% resistor, 0603 or 0805
• UI:  ATTINY13A MCU, SSH or SSU variant
  • * symbol indicates MCU Pin 1 location
• Spring / LED leads
• OTC:  1uF MLC capacitor, 0603 or 0805 (X7R preferred)
  • Pad with side closest to MCU can also be used as electronic switch pad
• P:  2x ~40K-80K 0402 or 0603 resistors