Hello,
Does anyone have suggestions on good but cheap/disposable air foils? As we are doing test fires, many of our rockets are being lost. A cheap, disposable, and even biodegradable body is pretty easy to make, but the fins are proving a little more difficult. From chunks of cardboard to repurposed dollar store toy parts, we feel like we've tried or at least considered a lot of options. For the most part, they are always either unstable or unsustainable (take too long to make or cost too much to get in quantity).

Does anyone have suggestions on something cheap and easy, yet viable? We've looking for either "DIY" or store-bought options, but preferably not items only bought online, or 3D printed. These are mostly for low-power rocketry, so options of..."questionable" quality may be viable.

Thanks!