Sign up for GCAP and download some of their plates. They print off nicely on A5, and are simplified - saving you having to squint while flying an approach. Check they match the AIP plates online and make sure you have the latest. I have an A4 kneepad, and find the ring binder part very useful for keeping all relevant plates together. Otherwise purchase the expensive Jepp ones, and they are also readable on A5. The standard free AIP ones aren't very readable.
Transair used to sell Jepp plates on a per page basis, with one airport maybe being 10 pages and costing something like £5, but not sure they do that anymore. As I say, GCAP ones are perfect for the IMCr