If the controller they released a while back is indicative, they're not going to be super cheap by consumer peripheral device standards, but they will be amazingly inexpensive compared to the existing semi-equivalents.

Current stuff basically assumes you're either loaded or insurance is paying for it in terms of cost (plus they're made by smaller companies which have to make back their R&D plus exorbitant medical certification costs off of a small production run). This stuff will likely be at least somewhat affordable without insurance, but hopefully they have also gotten it certified so that insurance will have a chance of covering it for those who still can't afford it at sticker price.