The Jet I MK II IBS was discontinued some time ago, the last place that had any in stock was JetBeam's official French distributor NeoLumen; I know this because I ordered one from them last fall, and then a few weeks later it wasn't on the site anymore.
Your next step is to head over to the CPF Marketplace and post a Want To Buy.
I EDC mine loaded with a 14500 daily, I think you might find it's worth the hunt. Good luck :thumbsup: