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Canadian Tire has lots.

also has lots for sale.

Walmart, Canadian Tire, NAPA, Auto Parts Central.  
It doesn't matter what kid of car you drive. Coolant for gasoline engines is all the same. There is a coolant for diesel engines too, though I am not sure what the difference is. I imagine it has more to do with diesel engines starting in cold weather.  
 
You can either buy pre-mixed or concentrate.  
 
Edited by AndreaD., 2016-11-12 13:46:07

Buy the premixed. It costs twice as much and already has the water mixed so you don't have to figure out the 50/50 mixture. Seriously, buy the concentrate and an equal amount of distilled water. Mix 50/50.

AndreaD. said "Walmart, Canadian Tire, NAPA, Auto Parts Central.   It doesn't matter what kid of car you drive. Coolant for gasoline engines is all the same. There is a coolant for diesel engines too, though I am not sure what the difference is. I imagine it has more to do with diesel engines starting in cold weather.     You can either buy pre-mixed or concentrate.     Edited by AndreaD., 2016-11-12 13:46:07"

Are you sure about this statement???  
 
Different car manufactures use different types of coolant and cannot be mixed so be very careful what you purchase.  
 
There is universal engine coolants that are suppose to mix with all types of engine coolant.  
 
Do not mix standard green coolant with red or gold coolant!!!

all coolant is NOT interchangeable. and do not use the universal crap cause it will still void warranty if you have a new vehicle.

Hyundai doesn't use extra long life coolant like GM Dexcool. Regular Prestone antifreeze will work fine.

Killing myself laughing over here lmao hope none of you are mechanics! The premixed green coolant is fine for hyundai lol as it is with any other vehicle lol.

Pre-mixed universal coolant as a top up is perfectly fine.  
 
If you use green in other coolant colours as a top up your vehicle will not decompose or blow up.  
 
If you do mix because you have to get your a/f changed asap and find out why there is a leak.  
 
 
The important thing low a/f levels can cause a over heated engine. Best to use the wrong A/F for a short term than having that happen. I use Zerex ( red) and make a 60/40 mix as a spare in the trunk.  
 
The convenience of premix is a god send for us lazy people. I am too cheap to buy it.  
Yes I own a 3.1 GM so I am used to top ups.  
 
The Canuck Tire the last I checked was pricier for antifreeze than some. Especially the premixed.

If your sonata is over the 2012 year it does take a long life coolant it is green and colour and recommended by Hyundai if it's just a olds sonata it uses regular green antrifreeze. Don't waste the money on the premixed stuff.