Hello owl_burrito, and welcome to the Mattress Underground!
We have some Hastens floor models that we are selling out at a discount; unfortunately the 2000T is already sold out 
But there are others.
As you know, there are several Vispring models with horsehair; the Regal is the lowest priced model with horsehair. Keep your eye out as we get closer to Black Friday, and there may be a chance for price reductions.
We also have our own brand of innerspring mattress that features pocketed coils to reduce motion transfer; one of those models has horsehair as well, and is at a lower price point than Vispring.
We do have latex models that have very little motion transfer; those may be worth a try as well.
We have locations in the New York area and our Black Friday sale is coming up soon!
Best of luck with your search!