They don't sell to the general public a few hand picked babies. That isn't worth their time, nor does it make financial sense to them. You'd have to purchase thousands of babies at a time, and you'd have to have an import license to bring them into the country.
Additionally - even if you could hand select a few, the costs to get all the paperwork in order to import them would make it cost prohibitive for a few fancy normals (any new mutations are offered to the big boys for big bucks).