rigid airline tubing

I was watching a video of a guy sitting up his reef and he cuts pieces of hard airline tubing and uses it to help support his live rock (inserting tube into the holes in the rock). He also drills holes in some corals and inserts the tubing so he can place the coral where he wants it. I think this would be a good way to help stabilize my live rock, but I've never seen a place that sells this hard airline tubing. Any ideas?
 
I have seen some Hard Airline tubing that is used strictly for uplift tubes but thats it. The longest I have seen was probably 2ft.
 
I know that both Petsmart and Petco have it as well as my LPS have it. The hard line tubing used to be used for UGF at one time. I use it for air tubing in my phytoplankton cultures.
 
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