Dunno if this is common knowledge or not but Yohji has a few online-only brands at fairly reasonable prices (no where near mainline prices #tybg)
http://syte.yohjiyamamoto.co.jp/S'yte, which is unisex casual drapewear for lounging and artful pools

Ground Y, which has some graphics designed by this cool Japanese artist whose name I forgot. As far as I know it was a streetwear-friendly line aimed at the yoof, only intended to be sold in one store in Tokyo but I guess it's online too. The pants are tuff

Y's which I guess is a diffusion line now

and Gothic, which is jewelry and sweaters I guess. Also selling two books: Rizzoli Yohji book and Talking To Myself.