It was 39000 won, which is about $40 in the US. The States sell it for $30, so I wish I could have bought it when I was there.
But still, I'm happy to have it.The device was smaller than what I had imagined. I was thinking about the pokewalker size, but it's smaller. Makes sense because all it needs is a button.
Is it worth the price? I can't say yes. I'm not sure if bluetooth devices are expensive in general, but the Pokemon Go Plus may feel like a waste of money for some people. Not for many reasons though. the only complaint I have is about the low quality "one size fits all" strap and the device's vulnerability to scratches. Both are minor flaws though.
It's great for playing on the Go. Not needing to look at the screen makes things much more convenient. I'm playing more Pokemon Go these days thanks to it.