BIG50
Below is their description of this sale:
The weekend starts here. Save 50% on the entire range of eBooks at packtpub.com
Get an exclusive 50% discount off all eBooks at www.packtpub.com this weekend. This offer is available on our entire range of eBooks (including pre-orders) for 4 days only – don't miss out! You can use the code as many times as you like in this period.
Just choose your eBooks and apply this code in the shopping cart:
BIG50
I've got heaps of these - really well written and on current topics, and they'll send to kindle for you - already filling my basket!