My 2007 T&C only has about 34,000 miles but the tires are over 8 years old.
Costco has $70 off of 4 Bridgestone tires plus for Executive members the install is free.
I bought 4 - 70R 15 215 tires installed with tax for $317. Have to order on line.
Deal ends I think on 11-28-15. Discount code is KVW582Q. These can't be any worse than
the OEM Goodyear Invictas and I have no complaints about those. {The Invictas are 70R 15 205].