Best Bounty strategy to seek out bugs in code.

[kwaasteniet]

We reached out to  Zeppelin to have our smart contracts audited but we found their service to be on the high side  probably due to all the demand they are getting.


What is the best method to get code in our smart contracts audited and challenged?

Are there any other bounty services that one can recommend to audit and reward hackers to exploit weakness in the smart contracts?