You could also try 0% on credit card then switch balance if not cleared in time to 0% balance transfer only charge would be for transfer of balance
That's your cheapest option.
True but you could become stuffed if you can't change cards at tthe end of the "free" period. this is especially valid if you have undertaken many credit enquiry searches. Admittedly even if you did get locked into a high interest rate you would at least have flexibility over how much you paid back each month.
Businesses don't like uncertainty as a general principle. Sometimes it's better to pay more and know how things will pan out with certainty.
Whilst Robert is always wise to say their is no right or wrong answer to your question, do remember that we are always advocating to our clients that cheapest isn't always the best long term option.
Roger