I saw a friend of mine get a letter today advertising half price Sky + for 12 months with free install. Ring 0818 762 867 and quote 'Irelands No.1 offer'. Fatcheese are giving up to €135 cash back if you book online but I imagine if you then ring quoting the half price offer you might get that too and perhaps more if you play hardball.
Btw. Sky broadband.+ phone is coming this way in the next few months. There might be even better deals to be had then.
Edit: I have added a pic of the main part of what he got as an attachment.