Can you tell me where in Japan to buy Ramune?

I would like to try some of the more unusual flavours of Ramune like Curry, Yakisoba and Squid Ink but can't seem to find any online (apart from JBox).
Can anyone tell me where I can buy these sorts of flavours?

Perhaps, I think that it can buy in the Village Vanguard.
Since unusual drinks and sweets are selling.
http://www.village-v.co.jp/
Or, it might have sold in the chain of candy shop(Dagashiya,‘ʉَq‰®�j.
I have seen a ramune in Ichome ichibanchi.
Might it sell to Dagashi yumeya.
http://www.yumeya-jp.com/company/tenpo.html

Kimura drink sells RAMUNE of curry flavor
http://www.kimura-drink.net/english_site/ramune.html

You can buy Squid Ink Ramune (Ikasumi Ramune) in Hakodate, Hokkaido. (ƒCƒJ�[ƒ‹�¯�lŒöŽ®SHOP)
http://ika-r.shop-pro.jp/?pid=82914080
http://www.ika-r.com/shrine.html