Credit cards?

Does any 1 know of any 0 % deals on balance transfers for exsisting customers? i have a mint,mbna,virgin,lloyds,natwest and barclaycard. all my balances are clear apart from my mint and i need 2 transfer it to 1 of the others asap! i no barclaycard do a 6.9%pa on balance transfers untill the balance is cleared but are there any better ones for my other cards?
Answer
Wilfred is right. perhaps apply for a post office credit card? i have been looking at a few and this seems one of the better ones.