Amazon (the dot com one, not the rainforest one) has the Firefly Complete Series Blu-Ray set/collection/whatever you want to call it, as it's Gold Box Deal of the Day today.
Which means it's 56% off.
Pretty sweet deal.
Click on that picture of what it will look like when you get it if you'd like to buy it, won't you?
UPDATE : It is no longer 56% off. Hope you got yours while the gettin' was good.