Being looking for a train for Christmas for a reasonable price and i found this, it goes for $ 82.14 on amazon and the good thing unlike others that you find in Walmart and other retailers is that this is expandable. bellow are the expansions on amazon.
https://sellout.woot.co
On this video you can see how big is the track: https://www.youtube.com/watch?v=UUYcPGS
Bonus points: if you have a 3d printer, you can print the expansions yourselve and save a bunch of money.
https://www.thingiverse
https://www.thingiverse
Amazon for comparison:
https://smile.amazon.co
Tracks:
https://smile.amazon.co