TIMING BELT

Usually by the time the t-belt is ready for replacement, the water pump, cam and crank seals are due. I'd recommend drive belts, too. the coolant will have to be changed when you replace the water pump. I don't think there's any need for a coolant 'flush,' or thermostat replacement, under typical circumstances. It's probably a $500 to $650 job, depending on who does the work, local labor rates, and parts prices. If you want to find a specialist, here's a directory link for you: https://repairpal.com/toyota-repair-in-huntington-beach-california