Not really, anywhere that's convenient to London has basically the same prices as London. If you do end up saving money it's because you're taking one of those awkward 90minute+ journeys.

sure, if you like reading standing up for 90 minutes while someone breathes down your neck.

The transit system is exploding, living in the commuter belt these days is a special kind of hell for a lot of people.

And don't think you're getting seats on the underground either.