That's a fair trade. Perhaps if anything favorable to you.
96fs are quite common; the 2.5" 686 with the (highly sought after) factory combat grips are not. I'd happily trade a 96fs and $100 for that Smith. One thing I'd caution you on: the 2.5" 686 is not quite fish nor fowl. Considered too small for field/duty use and too big for concealed carry. But that doesn't mean it can't do either. It's a fairly full-sized revolver and doesn't conceal carry well. I tried using one for a while instead of my 2.5" 19s, and the weight and bulk became tiresome vs. the lighter, more concealable 19's in the 2.5" length.
However, it's a great gun for field use, nightstand duty, occasional carry, etc. Even with two 19s, a 27, and a 28 around, I keep a 686 (albeit 4") around for wet weather and field use. Those caveats above aside, if I had a 96fs around, I'd offer it up and $100 for that particular 686. In a New York minute.