This is what I picked up the other day. Its the Godox iM30. it cost me 35 bucks. TLDR: get it if you need one.

Very easy to use, and very good build quality. Takes 2 aaa batteries and can fire off up to 230 full output flashes on a single charge. I only needed to put it up to maybe 1/4 power for my tests but it can last a very long time. Since I was testing with my Leica Q, what is great is that you can use whatever shutter speed you want since its a leaf shutter. Other cameras limit you to the 250th

Just a few test shots here, nothing too amazing but the experience using it was great. Goes quite a far distance and easy to configure since it's all manual. The diffuser works, but it drastically reduces the reach (obviously).

Here's the link (no, it's not an affiliate):
https://www.amazon.com/Godox-iM30-Diffuser-Mini-Flash/dp/B0F6MKQQS2