Time and cost for level 3?
Level 3 costs 1.3 million gold and takes 1 day
I got mine to level 3 yesterday, haven't seen them in action just yet as my TH is outside so people just snipe me. Although, the level 3 skeleton traps looks awesome!
TH 10 - Level 166 - 1,3 billion GG - 7,7 million HH - 115 Level 11 Walls - 135 Level 10 Walls - AQ Level 40 - BK Level 40 - Trophy Record: 3803 (set at TH 9)