Home bargains are doing a scratching post for 4.99, it is beige and brown, the base is a paw shape and has three mouse toys attached. This is the cheapest I have seen and have looked in a few places. It is a smallish height and would probably more suit a kitten, though my 22 year old cat loves it and doesn't let my kitten get near it.
Found in Southall branch, but is online so you can order in to collect in store.
Also bought some cat food tins in there it was by Hilife, there were different ones some had real fish pieces and prawns, another had seafood and it looked like squid, salmon pate, tuna imperial, chicken pate,tuna and prawn pot and chicken in gravy pot. All of them were the small sized ones roughly 80g.
Also 6 tins of whiskas in a pack was £2.99, good price as I haven't seen them for that price in the supermarket recently.