5 custom rune pages vs. 2?

Was talking with a friend and found out they only have 2 custom rune pages (their account is lv.34) when my account (lv.54) as 5 custom rune pages. Not sure if this is a bug or not, but I was under the impression everything about runes was unlocked once you hit lv.30 Can I get clarification if this is a bug of not? Edit: I appreciate the responses guys! I honestly didn't know you could buy rune pages anymore, so that's great to know
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