I am plan on changing the spark plugs on my 3.5. Should i change the intake gasket or is it reusable? Anyone know where to get a new one?

The gasket i am talking about is the one that is six holes in parallel b/w the upper and lower manifold

 

When I did mine I just replaced it . I think it was about $30 at the dealer.

 

I used a little gasket sealer with the original gasket.