Hello Aazealh, sorry for the late answer , I didnt notice the new topic. My brother found it in an Animate store in Kyushu. Nowadays, Animates not the same store they used to be (less otaku more moe/yaoi/mainstream) but some (not the one near tokyo) may have some old stock.
I only have commons/uncommons from bk5, so everything else in the box is net new for me, and I'd probably sell/trade the duplicates to recoup the cost. I agree it seems overpriced, but I've not seen a better deal this year other than single bk2 boosters on suruga-ya. If you've got a lead on a better deal I'd surely take it!It's not worth it. What will you do with it?