Some repair shops will quote timing belt replacement only and some will be up front and quote for all the parts and labor operations that are likely to be needed. Ensure if you are calling around for an estimate that you are comparing identical repair operations and parts. The full list of parts would be the timing belt itself, two camshaft seals, a crankshaft seal, a timing belt tensioner, a timing belt idler bearing, water pump, antifreeze/coolant. Basic labor to replace the timing belt is 4.5 hours, add .6 to replace both camshaft seals, add .2 to replace the crankshaft seal,
Timing belt approx $35 to $45, seals $6 each, coolant $15, water pump $100 to $140 add .4 Hours to replace pump, tensioner and idler approx $150. Fan belts and water hoses may also need to be replaced as required .
Just had it done today on my 2002 Honda Odyssey and the cost was just under $1200. This included the timing belt, tensioner, water pump, new coolant and two new external belts. They charged me $750 for the timing belt replacement kit, but I see them advertised online for about half that price, so I would check with the shop if you could buy your own kit.