Sony Online Entertainment is looking to move a bunch of its pre-paid Station Cash cards. As a result, all such cards (available at retailers including Wal-Mart and Best Buy) may be redeemed for triple the normal Station Cash points. The promotion is valid from May 27th through May 30th, and SOE is also making a few special items available in select games to celebrate the Memorial Day weekend.
EverQuest features a number of paintings for sale, EverQuest II is giving away free time-limited flying mounts, and Free Realms is selling discounted Memorial day clothing packs for 400 Station Cash. Star Wars Galaxies is throwing a "bonus everything" weekend featuring double XP, double GCW, and double a-bunch-of-other-stuff, the details of which you can find on the official SOE forums.