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?
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