The Octave Records site will tell you what various charges are, will give you a (bogus) total, and will charge your card for a completely different total.
For example, when ordering the Audiophile Guide SACD, it said this:
Yikes. Thanks for the heads up and on Monday I’ll have Kevin fix it right away. If anyone was overcharged please let us know and of course we’ll refund whatever is in error.