About 75 quid I would say!
Plus with the Pay once offer you get a 2 mix for the first 3 months ( I think those numbers are right).
You have to remember to tell them you don't want to continue with the 2 mix otherwise the start charging you the minimum subscription after the intial period. It is a lure, hoping that you will continue subscribing.
Having said that, it is obviously a better deal, as long as you remember stop the subscription.
Robbo
Edit, its for 4 months and 4 mixes
(from Argos website)
For £75 new Sky TV customers get over 200 free digital TV channels & 4 months of the 4 most popular Sky Entertainment Mixes (normally £19/month). After 4 months you'll continue to receive Sky TV for £19/month. If you no longer want to receive Sky TV let Sky know & continue with the free channels.
On receiving your pack call Sky (08705 95 95 95), quote the unique reference number in the pack to book your installation. Have your credit card/Direct Debit details ready - this allows you to order Pay Per View movies & events & continue to watch Sky TV at the end of the 4 months. A professional engineer will bring all you need to get you set for the digital switchover.
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