Suited connectors are most cheap to see the flop in late position or in the banks, which included many players (at least 4) in the hope of collecting a strong combination (set, straight)
I am going for the cheap flops with not so good cards Q2,K4,something like this ..
For hands like A10,AK ,or pair i am going with 3BB , but this depends on you , not everybody is playing the same , you should make your own strategy .