I am guessing this is to replace timing belt. Take a look in your owner's manual to see if there is also a time for the maintenance, like 7 years or 105K miles. Also check that your car doesn't fall under the severe conditions category. I would replace that belt when it is due. A failing timing belt can look good one day and break the next.
I do most of my car work, so that price is high to me. You might want to look for shops that specialize in hondas or foreign cars and get some quotes.
2005 Acura TSX MT