I noticed the pricing is way off on most of those cards. Take FBB Hypnotic Specter for example. Any plans on updating them?

I messaged the Deckbox Team through a support case and got the following answer:

Q: "I have reported a wrong price for some FBB cards. It seems that all FBB cards have a much too low price. Maybe you could take a look at this."
A: "Yeah, this is an old problem and one I really have to address. I wrote this on the todo list, thanks for reporting."