BUT!! I'm not so sure Super Shocks have reoccurring bladder problem. (kinda funny wording) I would argue they don't.
Did you buy them new?
Did you follow
THESE instructions. I see he doesn't say much in the ways of leaving them a certain small percentage empty, but he does say compress them.
You may not find another bladder. It's not a common upgrade. I have seen people run Losi 1/8th scale shocks on these trucks with success.