Wonder if anyone can suggest site/sites to look for bounty campaigns?
What about - bounties board
https://bitcointalk.org/index.php?board=238.0You can find all bounty campaigns there, not sure how you have missed it.
Just a little reminder - you won't be able to join signature campaigns until you reach member rank(do research about forum activity and ranks) but you can join social media, blog, translation and other bounties.