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Looks like Blackberry are running an offer for free BES 10 CALs.

Activate a Blackberry 10 device and get two free CALs.

http://uk.blackberry.com/business/blackberry-10/blackberry-10-ready/license-offer.html

Activate a Blackberry 10 device between July 1st and August 31st 2013 and for each device you will get TWO free CALs. These CALS are the EMM Corporate type so will work for Blackberry 10 devices and Android/iPhone. At current prices they are worth almost £70 each.

The BES 10 software is free (trial download on the link above).

The window to claim the free CALs is quite small, so Blackberry have provided a link to be told when the registration process is open.