Prices seem to vary a lot when googling these items. I take it you are bandaging a nasty injury?
Ebay good for some aswell as online pharmacies. Often just as useful to buy a large box of each as you will probably require more than you think.
Remember these are the brand names of certain types of bandages- there are several makers of similar bandages just with different names for them.
You are basically looking for a non adherent perforated film dressing ( depends on the wound which is best), a wool padding type bandage (a standard cotton wool roll from boots can be an excellent substitute if lots required for a period), basic crepe bandages and elastic self adhesive bandages. Using these descriptions to search may help you find cheaper alternatives.
Do consider using a silicon contact dressing for easy removal if adhesion to wound is a problem, or a foam dressing if exudate more of an issue. A silver dressing may help if it is dirty/ pus/ pouring ect.
Thanks, that's very useful Its for bandaging post surgery, so the wound is the incision with stitches. Vets very kindly gave me a list of what I'd need as have run out of insurance money!