This seems like a good book for me to start off my bass learning.
I ordered it as an eBook from Mel Bay, and was looking forward to an evening of left hand finger contortions, but... although I received an email from them with my account details, the order email said my order was "being reviewed" - whatever that means. I could log in to my account, but when I tried again just now it says it can't find my username. (The same username I used successfully earlier, and is provided in their email to me).
Although the payment shows up on my CC account I have no promised download link, and no account. So my confidence in Mel Bay's ecommerce technology is a bit shaky.