I built a DIY Stream Deck for $50 in parts using Arduino! (Tutorial link in the comments!) I also released all files/code for free so that you can build your own! :
How I use my Stream Deck for streaming on Twitch and YouTube | MattStauffer.com
How to Use the Elgato Stream Deck to Hack Your Productivity
Elgato Stream Deck - mimoLive - 5
Building a DIY Stream Deck (Mini Macro Keyboard) - Parts Not Included
Stream Deck + AutoHotkey + PowerPoint = You're Welcome – Thinking About Things
Elgato Stream Deck – Quick Start Guide – Elgato
Elgato Stream Deck Review - StreamScheme
Elgato Stream Deck for Live Streaming Tutorial — Lights, Camera, Live® | Elgato, How to memorize things, Video marketing
Keyboard Maestro and Stream Deck for Fast App Launch - Joe Casabona
Elgato Stream Deck review: A Mac accessory you didn't realize you need | AppleInsider
Stream Deck & Touch Portal - 100's of Key Icons in 5 styles | Nerd Or Die