Book-off is your friend. It's a used bookseller, but it also has CDs/DVDs. There is no central store, so you just have to luck out with what you find, but there are tons of them everywhere. Especially if you to to the ones in Tokyo, you have a high chance of finding Ringo stuff.
I found magazines featuring Ringo, Ringo BOOK, MoRA boxset, HF Premium box set, and they also had concert DVDs/Bluray that I did not buy. And they are most likely cheaper than retail price because they are used, but everything I bought was in tip-top condition.
If you are looking for newer stuff, go for Tower Records, since they usually have posters for the new releases. Any major electronic store will have a music/DVD section.
I will say though that in the beginning it was a bit difficult for me to navigate, and I was already at a conversational Japanese level. So there's that.
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