when it comes to online finds, i would say google, just search "food grade hoses" and quite litterally the first few sponsered results, and a few of the regular results have exactly what you need, in more than just plastic, i believe they have other materials as well for some of them.

as for places you can drive or walk to, im not sure what is around you, but a hardware store, or maybe a restaurant supply, store would be ideal, or atleast they could order you one. Maybe not a place like a homedepot, or lowes, but maybe like a southern states, or ACE hardware.