Heh, I know the feeling. It's about to get expensive for me too. I decided to go with the 901 atty idea for my mom and husband so I got 2 of those. Then I picked up a couple of packs of carts for those. (Mind you, I just bought 4 packs of Coolcarts for me last week.)
Then as I'm checking out, I realize I probably better pick up another KR808 battery in case I need to leave a couple with my mom. Then I notice the passthrough that I've been dying to try. Ugh, so much for the next couple weeks of juice.
Ah well, the bonus is that mom can get a bit of nicotine and the motion while she's in the hospital. If she doesn't take it up and hubby doesn't either, I'll be trading off some 901 attys and carts.
Now to go figure out how these attys work. I've always ignored those conversations since they weren't applicable. Guess it's time to learn about blowing out an atty and filling carts.