Where to find cheap, very long rack and pinion

length will extend to 10 feet. Thinking hobbyist/plastic. Don’t know Size but prefer as small as possible. What’s your goto site?

edit= this is a twisting curved track like a roller coaster so flexibility would be necessary. I want a small spring motor to pull itself down the track from end to end. Thinking rack and pinion the way to go but open to other suggestions

submitted by /u/Legitimate-Emu-615
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