Just been into my local Wilkinsons and they have High School Musical books on offer.
HSM - Heart to Heart
HSM - Wild Spirit
HSM - Broadway Dreams
These are between £2.74 and £4.49 on Tesco website so not a bad price . They also had six different Hannah Montana titles for the same price. These where at the front of the store in a red trolley. Not sure if this offer is available in every store but if you can get hold of them they will make nice little stocking fillers for your little HSM/HM fan.