I'd been looking for ages for sleeves to protect the discs that come in the cardboard Digi-Packs - that would fit. I found its all too easy to scratch the discs, and a lot of the sleeves are just too large.
SoundSourceCDs in the US are the only company I have found that sell thin rounded PVC sleeves that fit into all the cardboard Digi-Packs I've got - they'll ship to the UK so I assume they'll ship elsewhere.
http://store.soundsourcecds.com/index.php?main_page=product_info&cPath=66_73&products_id=212
SoundSourceCDs in the US are the only company I have found that sell thin rounded PVC sleeves that fit into all the cardboard Digi-Packs I've got - they'll ship to the UK so I assume they'll ship elsewhere.
http://store.soundsourcecds.com/index.php?main_page=product_info&cPath=66_73&products_id=212