Saw a guy using one of these on a brisket in a Youtube video, and I just had to have one.  Haha
Thought it was broken at first as it wasn't pressurizing.
After a bit of head scratching, I found I wasn't tightening the top enough after putting water in.
Put a little effort into tightening it and it works great.

I missed this response but I will give this version a try. Thanks for posting. I have a similar device for injection

Good find.  It's difficult to locate pump-up or battery powered sprayers that are clearly labeled that they are made of food safe plastic.

What's the brand and or place to look at it?

The brand is:    Agri Pro Enterprises Of Iowa
Just google  -->   "amazon Compression Sprayer 1.5 Liter"

I just googled it and found all kinds of them.
Lot of different prices, but don't know if any are better or worse.
This particular one shipped direct from China.

You can find sprayers like this in any Lowes or Home Depot.

how do you plan to use this for cooking?