Matchbox Cars Value Where Can I Find The Value Of Old Hotwheel & Matchbox Cars?

Where can I find the value of old Hotwheel & Matchbox cars? - matchbox cars value

My son, grandmother gave 2-car of the year a few years ago at Christmas. They are in their original packaging and in good condition. I wonder where I could go see the value of them. A car is a 1969 and the other is a 1973 truck.

Thanks for the help