$99 free calls with Engin at Harris Technology
"Purchase any engin product from 31/01/07 and receive $99 of free local and national calls, to be used over three months. This offer is only available on engin services activated by 30/04/07 (excludes engin Voicebox Series 1 and Voicebox Series 2)."
I have checked the Engin site and can't find the deal mentioned anywhere there, but HT do not mention that is exclusive to them.
The link shows you the Engin products that the deal is available with.