I'm not familiar with the PS model. When you have enough posts, you could put a post in the classifieds.
What kind of passthrough? A 5V straight thru or a 3.7V battery type.
Litecig has, or at least had, a passthrough with a separate inline 10440 battery. The handpiece looks like a 510 e-cig and puts out 4V pretty steadily. I've had it for 2 years and it's the only passthrouth that hasn't broken down, outside of my bulletproof Baby Bullet 5v one. IIRC it was only about $23