That Corbyn fella...

That's not quite true. It just doesn't get awarded to very high-profile people most of the time, or twice recently to 'the people and government of the Republic of the Marshall Islands' and 'the people and the island communities of Lampedusa (Italy) and Jeju Island (South Korea)'.

http://www.ipb.org/sean-macbride-peace-prize/

The last time anyone high-profile received it was Chelsea Manning in 2013, and there was at least a scattering of mentions in the press:

https://www.huffingtonpost.com/2013/10/09/chelsea-manning-peace-prize_n_4071853.html

https://www.theguardian.com/world/2013/oct/09/chelsea-manning-not-a-pacifist

It also gets referenced quite frequently in articles about Manning that have appeared since.

But it's certainly true that it's not very high-profile in itself, possibly because it's non-monetary. Some leftist sites mention it:

https://skwawkbox.org/2017/12/09/corbyn-receives-international-peace-prize-in-geneva/
https://www.friedenskooperative.de/termine/sean-macbride-friedenspreis-2017-an-jeremy-corbyn

I don't know why the IPB isn't known better; I'm sure I've heard of it before, but didn't actively remember it. It was founded in 1891 so has probably been out-profiled by other organisations.

https://en.wikipedia.org/wiki/International_Peace_Bureau

Perhaps most notably, a long list of its members have received the Nobel Peace Prize.

It's also worth mentioning that Corbyn isn't the only recipient this year. He shares it with the 'All Okinawa Council Against Henoko New Base' and Noam Chomsky.

I googled "Sean Macbride Peace Prize"

Fair play. I wanted to, but after re-reading the article, I gave up as I couldn't see the actual name of the prize.

If the promo piece complaining about media bias has to keep referring to it as an "international peace prize" rather than its name you know it's bad.

It would have been much more credible to have run a story just saying he won it, why, and some background on its history.

My head read the last few paragraphs in this voice