suejat - I have bought flaxseed and guar gum whilst on holiday in Spain, trouble is I dont know where from, it was a very kind local lady who bought them for me on mail order.
Have you checked on google.es - see if you can find a Spanish stockist.
Re cooking with flaxseed, hmmm it depends on what you are planning to do with it, its good for baking, though some people say its an acquired taste.
Guar gum is good for thickening sauces, soups, gravies, stews and also for baking.
Happy New Year to you and yours x