Where to buy engine parts

[fastolds]

It is starting to look like my 205k 2.7 engine will need at least a partial teardown. I think i've got an internal coolant leak in #1 cylinder. Small one, but you still feel it on first startup.

Anyway, my question is- where to look for gaskets, timing set and possibly a cylinder head?

Is there anyplace not to shop?

I'm gonna start at the dealer, and then work towards Rockauto.

Thanks
Adam