What's a good reputable seller of devices capable of jamming digital/cell phones?

I will be traveling to a country soon where phone jamming is allowed by law.

When I’m there, I’d like to go on the internet and order a device that jams the abilities of cell/digital phones and text devices to send or receive their calls.

Then I’d take that jammer, and enjoy movies, restaurants, cafes, and camping sites… without the annoying fake-time chatter of phone users.

So, what’s a good reputable dealer of such jammers?

And one important thing: Anyone can do a Google search. I’m not asking you to Google for me. I’m asking if you KNOW of any reputable websites that deal in such things.