Poor credit rating and high rate cards

I have a poor credit rating due to some old defaults from before my divorce. These are dropping off now and are mostly paid apart from one which is charging a massive rate of interest and I am paying very little off the actual balance. They won't reduce the interest rate so I would like to balance transfer. Sadly as my credit rating is poor I can only get a card with another high interest rate. Do I just have to swallow this or is there something I can do or a product I can apply for geared towards people in his situation.

Thanks