Where to buy F7 study text?

well,
You can buy from Amazon, that might be cheaper, though not always updated.

Otherwise, i always order books directly from publishing.
So check google:
for kaplan – Kaplan financial
for BPP – BPP learning media.

There u can select your qualification and books …and order them.
With BPP u can buy e-version of books, but they will have only 15% of priting allowance.
Otherwise i usually order hard copies, but costs of delivery are quite high.