Saving a little bit on a brand price

Ruby loves dried tripe. She has a piece every other day as a midday treat. Her other two meals are reduced to take this 'treat' into account. We have tried a few makers and not all tripe is equal. Some absolutely stinks to high heaven. She likes this brand and it smells but not too much:

By buying a 2.5kg box, we estimate we have saved about between £5 and £8, depending on the smaller bags as a comparison. Not a huge amount but enough to make it worthwhile scouting the internet for the cheapest price. Other brands are available and some cheaper still, but they are usually the ones that stink!