Remember this product? You added milk, beat it with a mixer, and cooled it to set up to a light, mousse-like consistency. As of a few years ago, it was still available (Vermont Country Store, I think) but only in institutional volumes.
I periodically buy Sans Sucre brand sugar-free, lowfat mousse mix when I see it at Ocean State Job Lot. Expiration dates seem meaningless for this product, so I will use boxes years out of date. At one time they contained Nutrasweet, later Splenda. All I see on the SS website now is *baking* mixes, using Stevia. I have never tasted any form of stevia that wasn't objectionable to me.
Amazon still lists Splenda-sweetned Sans Sucre mousse mix, but at quite a markup. I intend to keep an eye out for any remaining product at OSJL and dollar stores.
Though the directions call for skim milk, I do want it to taste good, so I use whole, and add a small squirt of agave nectar to mask the boozy aftertaste of the sugar alcohols in Splenda. Prepared this way, it's a ringer for Whip 'N' Chill. I hear that Dr. Oetker mix is good but have not tried it, nor do I know what's in it, or the price.