There are many seeded flours available including one in the Waitrose range which includes chunky pumpkin seeds. Holland and Barrett and other health food stores sell most seeds in bulk, usually at reasonable prices and they can be added dry or soaked overnight. They can be lightly toasted in a pan and my favourite mix is pumpkin, sunflower and linseed.
Whizzing them in a blender to reduce the size and improve the availability of the vitamins etc in the seeds. is a good idea. In fact, linseed is so tough it will pass through you entire unless you break it up!
The Waitrose Love Life seeded and malted bread flour is currently 25% off so worth stocking up! http://www.waitrose.com/shop
Holland and Barrett will deliver to your door and often have special deals http://www.hollandandbarrett.com/shop/food-drink/