Where can you buy ethylene glycol?

Are you trying to make your own deicing fluid? Look in the phone book for chemical supply companies; Hexion Specialty Chemicals is who I always bought stuff from, and they'll bring you a drum of ethylene glycol.

Note the quantity: they don't want to talk to you for less than 55 gallons of anything. Then again, if you're deicing aircraft you'll use that much.

You can get a liter of it from Sigma-Aldrich for $77.80. You can get a gallon of deicing fluid for twenty dollars, and you can get a gallon of automotive antifreeze for around $10. Unless you are planning to make a huge amount of whatever it is you're making, or you need absolutely pure ethylene glycol for research purposes, buying pure glycol is economically foolish.