I believe I paid maybe $15 for a 16' long waterproof strip. You can just cut them to the length you need with a scissors, they're marked along the strip where to cut them. The size that fits the AP channel is 3528 LEDs. That number just refers to the size of the actual light chips in the strip (3.5mm x 2.8mm) they fit in the AP channel like a glove. There's connections on both ends of the strip so you can get lights for two cages out of one strip but you would need to get a second power source, connection pins, and transformer. Way cheaper than APs lights and they're color changing and remote controlled too.
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