Picture the scene: you've just spotted a gorgeous pair of must-have shoes in a shop window. They are perfect. Stylish, your favourite colour - almost like it was simply meant to be. But then, you spot the price tag. Knowing you could probably find them cheaper elsewhere, you're torn. If you spend more now, you could end up kicking yourself later (but with your beautiful new shoes). On the other hand, if you walk away and never manage to find them elsewhere, you may regret it forever. For savvy