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The Games for Windows Marketplace or Live or whatever they call it has their new deal of the week sale up. Fallout 3 is on sale for $9.99 ($19.99). Note this is for the version without all the DLCs.
All the DLCs are also on sale for 50% off it seems.
- Broken Steel = $4.99
- Mothership Zeta = $4.99
$9.99(Looks like they made this half off too) - Operation: Anchorage = $4.99
- Point Lookout = $4.99
- The Pitt = $4.99
The UK GFW site has Fallout 3 on sale for £7.49 (£14.99) and all the DLCs are £3.37. Not sure why Zeta is more expensive in the US.
If you buy Fallout 3 plus all the DLCs it’ll be about $35, which would be a bad deal. You can get the Game of the Year edition at Direct2Drive for $29.95 or $25.45 after a 15% off coupon.
However, If you just want the regular game and maybe one or 2 DLCs it’s a pretty good deal.
EDIT: Mothership Zeta is now 50% off in the US also, so it’s on sale for only $4.99.