Planks For Shelf (CT9)

Hi, I need plank type wood no less than 1m long to make a shelf in a cupboard. I have a few pieces for batten although some extra wouldn't be refused. The depth of the shelf will be up to ~530mm. It does not need to look pretty, I can sand and paint it. I don't drive but I have a large camping rucksack and will happily walk a couple of miles to collect. Also there are buses! But I'd prefer someone within walking distance of the Aldi in Cliftonville.