Thanks for your replies.
bri1270, unfortunately David Yang requires a $50 order and right now, the passthrough is all I need. It does look like a good product, though.
mss5366, I was just about to order from myvaporstore until I read about the manual switch and inline battery.

I don't understand what all that means, but I couldn't find a detailed description of the passthrough on MVS so I haven't completed the sale.
breakfastchef, I checked out the PS passthrough, and it seems your option might be best, but I hope they are ready to ship soon. I'm not known for my patience!
