How old are the tires? If older then 6 years they are junk for on a car, ok to use on a trailer. Wheels are worth at least 50 usd a piece. If they were 15" id say they would be worth more.
If the tires are more than 5 or 6 years old id say about 25 usd a piece
If tires are 4 years or newer id say 50 usd a piece
One thing you got going for ya is the tires are 14". Idk about canada but around here used 14" tires are hard to come by