You're going to have to be more specific than that. Which model, engine size, spec? Also, what exactly is wrong with your brakes? Worn shoes/pads/discs/drums etc?
Any decent motor factors will normally stock Punto stuff but you will need to know what's wrong! most factors have car details on their computers if you give them your registration number they will know if it is disks or drums but some models can have brakes made by different manufacturers - Bendix or lockheed etc this info is not always on computers. having the old parts available ensures you get the right bits & don't forget brake fluid will need changing if it is more than 2 years old.