I got my last pair in Trespass for about £25, in their sale. I can't remember what make they are, as they are in the boot of the car and hubby has the car at the mo' but as others have said, shoe/boot choice is a very personal thing. If you stick to well-made paths probably a good pair of trainers would be as good as walking shoes. I use trainers for made-up footpaths and my walking shoes for rougher,country walks. Don't forget that some good quality socks will help with the comfort, if going for walking boots/shoes,too.
Happy walking!