Yeah the Hacker AV famicom games all use those cases and I suppose they are similiar to those old plastic vhs cases they used before the cardboard ones. When you can find them complete with case and manual they do command a premium but it isn't that far out of the budget of most people, unless you sell them in lots. Thats where the real money is for these games.
Let me know if you need scans of the case and manual art.