A quick google for silicone hose brings up gvc.net - $88.62 plus shipping (and maybe tax) for 100ft of 1/2" peroxide cured silicone. Part no. 101-187843. Link should find everything from 5/16" up.
No idea if they are the best, cheapest, or any good at all.
Otherwise, the usual online brew shop suspects will sell by the foot for about $2/ft.
I use the 1/16" hose with some $0.60 springs I found with the correct ID from ACE hardware. I never have kinking problems and I think the springs look pretty slick as well.
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