Wellp, those doodads also come in usb-powered, not just AA. I usually go by LED-count. So 600 LEDs (2×300) cost me something like 13bux.
Difference is that I got these in like 4 days (non-prime), not 4 months.
And the controllers not only let you do fades, blinks, etc., but you can also throttle down the brightness, too. So on minimum, you should still be able to see the lines quite clearly in the dark, and get decent battery life.
And being that they’re 3×AA or 4.5V, I imagine they might work with a Li cell (haven’t tried it yet, though).