The old black ones are still around, -$5 on any game greater than or equal to $19.99 ... but the $5 coupon expired Dec. 31, 2004. They kind of have the right to not honor it, but I'm sure you could find someone who does.
The best are the green ones that expire Dec. 31, 2005. No longer in production, but you can still find them pretty easily at stores. I bought about 10 of them a while back ... there's plenty at my store, but I doubt I'll use more than 10 of them before Dec. 31.
Otherwise you're going to have to stick to the new, sucky ones described by dracula above. They are for games $30 and up, and are divided by console (and another one for EA games).