For example, Philadelphia is pretty cheap compared to the Bay Area, and already has an Ivy League university!

Pittsburgh is even cheaper and has Carnegie Mellon - not part of the Ivy League, but better than most Ivy League universities for Computer Science.

Philly also has a burgeoning tech scene. Not of the same size, scope, or influence as SV, to be sure. But a lot better than it was even 5 years ago.