Steam Deck's next model would focus on improving battery life, screen - Polygon
AKNES GULIKit Electromagnetic Joystick Module for Steam Deck, Left and Right (No Drift) Hall Effect Sensor Joystick Replacement Accessories for Steam Deck - Type A Thumbstick: Amazon.co.uk: PC & Video Games
iFixit's Steam Deck fan and battery replacement kits are in stock - The Verge