Not sure if you use Travelzoo for travel needs (they're quite good IMO), but they just sent this:

< disclaimer > I've got no stake in them, blah x 3 < /disclaimer >
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From the Travelzoo Newsdesk:

SAN FRANCISCO--MAY 21, 2009-- Tickets to see the San
Francisco Giants play the Atlanta Braves and St. Louis
Cardinals next week were cut by 50% OFF regular prices.

The discounted seats start at just $9 for games May 25-29,
including the Memorial Day afternoon game. This is the only
discount offer available for these four games.

The available ticket levels include:
- View Reserved ... $9 (reg. $18)
- Bleacher ... $9 (reg. $17)*
- Lower Box ... $20 (reg. $35)

* Individual Bleacher seats only available for May 25 game.

For more information and to buy these tickets, click below.
Enter the code MAY in the coupon box. Additional fees of
$1.75-$3 per ticket and $3.50 per order will be added. (Full
price tickets are subject to the same fees.)

http://www.travelzoo.com/Newsflash.ashx?587969-15711075