I'm glad you're enjoying the Head First series.
You can get the ebook versions of these titles you own for just $4.99. The details on how to take advantage of this promotion can be found here:
If you have any further questions or require further assistance,
You can contact us at:
1-707-827-7019 (outside the USA)
7:30 am to 5:00 PST
Customer Service Rep,