Ryuko Matoi Extra on Payhip and Patreon Store (Patreon)

You can also get this set at Payhip: https://payhip.com/b/CdFaY
Patreon Store: https://www.patreon.com/ArtKimochii/shop/ryuko-matoi-extra-65-illustrations-989146

Remember, Payhip offers a special discount when you add multiple sets from the same anime to your cart.

Note for iOS users: Apple charges additional fees, increasing the in-app price by 40% or more. It's recommended to purchase from a computer or directly through Payhip.