I got a Halo 2 Live Starter Pack (includes the headset and 12months sub) for £19.99 from Toys R Us although threre was another priced @ £29.99 so have a good rummage!
Theres a Splinter Cell 2 Live starter kit.Amazon.co.uk Is Splinter Cell 2 playable on the 360? And I'm supposing when you start the Xbox Live 12 month subscription from the game you simply migrate it to the 360?
Edit That's a used and new game. No good for live, eh?
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All the Splinter Cell games work on the 360 and remember the games are not linked to the subscription, they are just included in the pack along with a headset and scratch card which contains the 12 month code.
I got the PGR2 Starter Pack just after xmas for £19.99 but considering I already have a headset and the game doesnt work on the 360 I just sold them and got £10 so in the end 12 Months Live cost just under £10