I recently bought tubing for replacing my condensate drain line on my air conditioner. I think it was clear vinyl tubing if I remember right, just under 5 bucks for a 20 foot coil of it. Difficult to straighten the stuff out, if you can buy stuff that isn't already in a coil or at least isn't too stiff it will make things a little easier as the stuff I got liked to get kinks in it when I was straightening it out. I've seen better stuff that is sold in bulk by the foot where you cut it yourself and that stuff seemed much better.
Good luck!
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