The cheapest balance transfer card around

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Barclaycard
Barclaycard

You can get an extra month of 0% interest on the Barclaycard Low Fee Platinum, already the cheapest balance transfer card around.

When looking for a balance transfer card, many of us get a little too preoccupied with just how long we can avoid interest for. Should I go for the card offering 21 months interest-free, or the one offering 22 months?