that's my fault Nate. The two heat sinks are available at Digikey, I'm not sure about Mouser. Make sure you don't get that crappy version that TPA uses that has the three holes in in, one of which is conviently placed right in the middle of the device Anyways, the recommended parts are:
8 1 HS346-ND HEATSINK TO-220 W/PINS 1.5"TALL 0 1.49000 $1.49
9 2 HS216-ND HEATSINK TO-126 VERT MNT SLIP-ON 0 0.41000 $0.82