did you check autotrader or Kijiji . i found one on Kijiji a 1994 supra with 45km but its right hand drive if your willing to drive a rhd (right hand drive ) buy it its selling for $ 9500 CAD.
http://toronto.kijiji.ca/c-cars-vehi...AdIdZ276695241
i found another one with even lower km on it on autotrader but its also rhd and is selling for 27900 . it has 29,927 km and it has a twin turbo 3.0L inline 6 engine (2JZ-GTE with 4 speed auto )
http://www.autotrader.ca/a/Toyota/Su...0204113056281/
i also found a 1987 Toyota Supra 3.0 Turbo Targa Convertible but it has 80 km on it but it is cheaper than other two cars its selling for $4500 and has manual transmission.
http://toronto.kijiji.ca/c-cars-vehi...AdIdZ293808575
here is another supra but it has 70 431km on it and is selling for $ 22,995 cad
http://toronto.kijiji.ca/c-cars-vehi...AdIdZ294584699
it will be hard to find lower than 60 km since supras are rare these days in Canada especially lhd drive supras( you could try importing one from usa since more supras were produced there ). this also due to these cars being used in drifting , drag racing , track/ autocross racing . A lot of these cars are heavily tuned and may have been used in street racing ( fast and furious made this car popular with the boy racers / ricers ) so it would be hard to find one stock and in good condition . majority of the supras i have seen are right hand drive .if you cant find a lhd supra you could instead get a first gen lexus sc ( jdm version is the Toyota soarer) this car used the same engine as the supra for the base model or you could get a 240sx , miata , mr2( if you decide to get a mr2 get the gts this model has a turbocharged 2.0L 3S-GTE), 350z , 280zx ,ae86 truneo sprinter / levin corolla ( you can do a engine 2jz swap) , rx7 ( get a fc since fd's are rare ).
sorry if my sentences are hard to read and jumbled up. i hope this helps you and good luck on finding your supra . if you cant find a supra and really want a car thats similar to the supra get the 1991?2000 lexus sc 300(uses 2JZ-GE the same motor from the supra )