The second stage probably won't be recoverable, unless it is turned into something that resembles a mini space shuttle (due to the speed it has to hit the atmosphere, it needs appropriate heat shielding).
The first stage, which is 70% of the rocket cost, gets exposed to a lot of stress, so it may end up being reused only 10 times. But there is inspection and refurbishment costs -- this is still up in the air. I know the plan is to get it up to maybe 50 reuses, and 24-hour turnaround time. But that part still needs to be proven out yet. So on the low side, if minimal cost to inspect / refurbish, and it gets 10 uses, the cost drops down to 33% of the original cost. Adding back in refurbishment, plus infrastructure and staff, you are talking closer to a 50% cost reduction. Not bad, but not earth-shattering either.
If the second stage ever becomes reusable, and everything proves to need only minimal refurbishment, that is where you get 1 order of magnitude savings.