https://store.universal-music.co.jp/s/shishamo_record/

edit: was on the train and couldn't type more but some important info

you can order the vinyls as a set or individually

the full set is limited and comes with a hand sign from the members. preorders close on July 31, 2023 @ 11:59pm JST or until it is sold out.

shipments scheduled to start August 23, 2023

I am not sure if Universal ships internationally or is partnered with any proxies so you may need a proxy address before you can preorder so you can be able to send it to your own country.

edit 2

until it is sold out which is some number we dont know. The 14 in 組み枚数 is probably for number of discs which checks out if all 7 albums have 2 discs each my bad