Where Can I Find a 4 inch cool tube?

I recommend a 'Bake-A-Round' off ebay. Not quite 4 inches but fits nice inside some 4 inch duct work. Like 10 bucks.
 
Yep, EBay is the way to go. I've got one cooling a 400W MH and it works great but it does require a bit of DIY'ing.
 
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