Heat in a micro-wave oven 700 watt, for 120 seconds. This is a very filling bread and should keep you going for hours.
To save money buy flax seeds un-ground and grind your own in an electric coffee bean grinder, you will re-cover the cost very quickly, as plain flax seeds are much cheaper than pre-ground. They also stay fresher for longer as you only need to grind seeds as required. Once ground use straight away or store in a fridge. Un-ground seeds can be kept in a cool dry place, but do not need refrigeration.
For a real luxury bread try using Linwoods pre-ground products. Not cheap but packed with great items and taste fantastic.