The 6th grade teacher giving the Korean fighter -making class used a lot of window blinds. Roman window blinds — the kind that looks like a placemat, with a lot of slats or sticks connected by a weave of string — are apparently great resources. He cuts the entire blind to the desired length and then just pulls out the sticks. He mostly used round-stick blinds, which provided sticks longer and maybe thinner than bamboo skewers, but also used used flat-stick blinds for a horizontal spar.
Bamboo for mini kites can be shaved from anything, but what the instructor was using was a wok-scrubbing brush. He’d cut off a bristle, shave it down to the tiniest slivers, um, shave them down some more, and maybe massage their bend. He used magnifying goggles & a box cutter. (The box cutter was common, from their local hardware chain, but its blade didn’t wiggle side to side like the cheap Home Depot ones do.)
SquadronKites #202, WrightFlyer, StopMotion, Scale 1/9
3d Squadron kite German triplane