Haven't seen one yet and haven't heard about pricing on most of their stuff.
HDD cooling ain't rocket science and just a little airflow across a drive will usually lower temps dramatically...moving my 80Gig Maxtor from an upper drive bay to behind the 120mm intake fan was worth ~20°C.
I've also suspended, glued, taped and crammed fans to move some air across drives.
The crazies out there can also water cool their hdd's and really spend some money.