If you want to mount a sink on a board maybe something from Aavid Thermalloy for a solution. Also, I have harvested and used heat sinks from old computer motherboards. There are some good sinks to be had if you can do a little machining to tailor it for your needs. When I use commercial pre made I generally buy from Allied Electronics but any electrical parts house should offer plenty of solutions.
That is probably the direction I am going to go as I unfortunately dont have a junk pile of scrap PC parts kicking around. By the way what is the the silicon compound they smear all over CPUs before clipping the heat heat sinks onto them called?
There was a time when you simply took some thermal compound or thermal paste, spread a little on the heat sink or component(s) and screwed or bolted them to the heat sink.
Now we have TIM (Thermal Interface Material). Then too, it will always be heat sink compound to me. Yeah, born as the white sticky stuff. Now, especially to a home computer enthusiast this is what peanut butter is to an English muffin for filling the nooks and crannies.
Check this link out especially those names. Look when you want thermal transfer names like Zero Therm and Freeze just tell you it is great stuff. It always helps if you use the word Arctic in a name too as Arctic implies what? Why really cold right.
You would never name a thermal compound something like Dessert Stuff would you? Who would buy it.