Blink is offering a free BLINK XT (OUTDOOR) Camera with purchase of their 5 camera system. This is also includes the sync module so you can link them all up on your app.
IF YOU WANT TO PRE-ORDER BLINK XT, OR ADDITIONAL OUTDOOR CAMERAS:
Enter the code XTPREP at checkout to receive $20 off each Blink XT you preorder
You can preorder the XT alone through this link
I personally bought these and love them so far, they also have solid reviews on Amazon as well as no charge storage. Very nice compact zero wire system, with long recharge lithium batteries, and mounts included.
If you have Amazon Prime you can get free shipping as well through Amazon.