Punctuation 'but'

Is there too much punctuation in this sentence? Which is more acceptable?

Often, I think they still should, but, still, the premium’s given to these bigger sales.
Often, I think they still should, but, still the premium’s given to these bigger sales.
Often, I think they still should but, still, the premium’s given to these bigger sales.

The first sentence seems like too much punctuation, but is probably ‘technically correct’. I’d plump for the third one if I had to, but I want it to be as accurate as possible.