One software package called The Brain Fitness Program by Posit Science, and promoted on PBS (in a very infomercial-like manner), goes for $395 for a single-user

One software package called The Brain Fitness Program by Posit Science, and promoted on PBS (in a very infomercial-like manner), goes for $395 for a single-user license. It does seem to at least have some clinical studies behind it but that still seems like a lot to pay.