Sgt. Frog Season 4 Episode 168 Keroro: Grand Invasion, For A Limited Time Only, Sir! / Momoka, A Tanabata Exclusive, Sir!

Keroro notices that when things are available as exclusive, limited-time-only versions, people value them more. So he has Kululu build a gun to turn anything they want into these! But when the exclusive items flip over to "no longer available," the trouble begins...