This sounds like a potential Kickstarter project idea. A generic version, perhaps a pack of stickers to put on devices symbolizing misc. everyday things.
It looks like that button isn't standalone, and needs a phone nearby to work. I just want something with that form factor that makes a POST request to a URL of my choice, that's it.
It's 70 euros, which is an insane amount of money for a button, and it's huge :/ The one posted above is small enough to unobtrusively stick on a wall and less than half price this one. Hopefully they'll come out with a standalone mod.
The first line on the link is "The Internet Button includes a Photon, which can also be easily removed and used for other projects, a USB-micro cable and a removable plastic cover."
Rough bill of materials is probably around 3-5 dollars (I searched online and found low power wifi chips in bulk at around 2-3 dollars). I'd estimate 10-15 dollars after R&D, assembly, packaging, shipping, etc. Does that seem reasonable?