12/3 20 Amp Extension cord?

In a bind and looking for a good quality 12/3 20 amp edison plug extension cord (UL of course for peace of mind). Running a distro box is a no go on this one and the biggest light on the shoot is 2k so we're only using stingers. All I can find are sketchy 15 amps and 20 amps with twistlocks. Any good sources at a decent price? If not it looks like I'll have to hit up Mole's catalog.
 
Any reason you can't make your own? You should be able to find decent 12/3 and 20A edison ends at pretty much any electrical or hardware store, and it only takes 10 minutes to assemble. Can't be more expensive than buying one from Mole.

edit: ah, I see you want UL. Picky, picky. ;)
 
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