[quote name='RollingSkull']At 33 cents a stamp, how does that break even?[/quote]
You could break even or better on those because you could also get $3 or $5 Best Buy Bucks, depending on the year ($5 in 2006, $3 in 2005). If you got really lucky, you could get the larger BBB at a near 1:2 ratio, at which point you'd be making a considerable profit.
As for the GGC, I'll miss it, but to be honest, I still have a few laying around that I've had for months. At least they have the new $5 off $19.99 PC game cards expiring in 2008, so it's not like they've completely abandoned the concept.