I've picked up a few of these computer uninterruptable power supplies for next to nothing (or even nothing

) after rebates. Susitna-flower has an APC 1500 Smart UPS. It's quite nice and I noticed it's on sale at Fry's electronics in Portland (Wilsonville) for a couple more days. I've been thinking of picking one up.
This little cheap one works fine for these small tanks, though. For larger heaters, I'd probably need something bigger, but the extra battery wires that I hacked into the case provide a reasonable capacity here. Sealed lead acid (SLA) batteries can be had fairly cheaply online. The four 18Ah 12V SLAs here were less than $150, including shipping.
I got the Penn-Plax Daily Double feeders for $15 each at my local PetSmart under their website price match policy. Turns out, I didn't really need them for the four days I'm out of town, but I guess I'll have them all checked out next time I'm gone for over a week. They have some limitations, but I found they could be made to work in my application. They hold a lot of food and must be filled at least to the 10-20% level to get consistent volumes dispensed. They also only work well with finely crushed flakes, but I found Aquadine to work, once it's crushed. They also seem to dispense the food over 10 to 30 minutes, sometimes; it doesn't all fall out at once. This can be bad if you have bully fish who eats it all, if it comes out slowly. I used a combination of sinking and floating flake food. The gouramis will then focus on the floating flakes while the rasboras get a chance at the sinking ones. Finally, the clamp on the feeder is rather limited, but I discovered clamping options, other than clamping it to top of the tank glass, as intended.