This type of tire retails for around $170.
I don't know the whole story, but before I met my wife she bought a set of 4 of these. After about ½ a year (roughly 15k km) she had a flat that couldn't be repaired and they convinced her she needed to buy a new set of 4. Some guy bought 1 off of her, leaving her with 2 used tires.
They have lots of tread left. $170 for the pair.