I've been searching for them but they are pretty old, some of them were uploaded but their are no longer available.
This is the link to their DLsite:
https://www.dlsite.com/ecchi-eng/circle/profile/=/maker_id/RG04800.html
This is the link to their DLsite:
https://www.dlsite.com/ecchi-eng/circle/profile/=/maker_id/RG04800.html