Unforunately, there are no malls at all in LaGrange. Basically all you'll get as far as shopping here are some strip malls along Route 55 or whatever other main road you're traveling, but no malls.
For the malls in this area, you'll be heading down to Poughkeepsie (and having known several former LaGrange residents, I can tell you for a fact that this is what they did) where you have the very large Poughkeepsie Galleria and what remains of the South Hills Mall (now called the "Shoppes at South Hills"). It will not take a long while to get there from LaGrange.
