I'm not entirely sure what the rules are as far as sharing outside links and promoting things but I think this is a cool idea. If it is against the rules, Mods please let me know and I'll delete the thread or you can do it yourselves.
So this is a link to a Kickstarter campaign (it's already been fully funded but has 27 days left. It's a 10 watt solid state amp that clips onto your strap button and is made specifically for smart phone intergration with apps like Tonestack. It seems like a great idea for people who live in small apartments and can't play with a full sized amp or for people who wanted to rock out on an electric guitar on the go. There's still a little over 100 spots left for people to get one at 40% off ($137 USD).
https://www.kickstarter.com/projects/846364129/jamstack-the-worlds-first-attachable-guitar-amplif