SpaceX CRS-3 launch scrubbed due to helium leak (opens in new tab)

Anyone know how much a scrubbed launch costs? Obviously much less than a failed launch, but just curious...

Hugely disappointing, I am sooo hoping for an awesome first stage 'landing' on the ocean. I have not been able to find any follow up on the 'gunk' that was leaking onto the space craft, would be curious to know what they found.