http://www.nintendolife.com/news/2014/09/sayonara_umiharakawase_and_code_of_princess_set_for_european_discounts
From the 4th September until the 17th, Sayonara Umihara Kawase will be on sale for €12.49 / £9.99 on the European 3DS eShop.
If you're in Europe reading this between those dates and you don't yet have it, I'd very highly recommend checking it out!
EDIT: On sale now. Also on sale for $19 in Australia!
http://tinycartridge.com/post/103647460777/yumis-odd-odyssey-for-10-plus-deals-on
I think that's a great price for anyone who hasn't already got it.
Sayonara Umihara Kawase is 50% off in Europe and Oceania until 1st January.
http://www.gonintendo.com/s/243894-agatsuma-hosting-3ds-eshop-sale