I went to HD, and they had plenty of the 3pk "holiday" cords, but they weren't on sale. I looked into using the SPT and female plugs for the outputs like you are planning.
I found the 1000ft SPT-1 for $130 and the female plugs for .65 to .55 in quantity plus about $23 in shipping. Did you find any better prices?
I guess I have another question now. Do most people use a dual AC input or a single? I am used to using the dual inputs on the LOR for 30A max, but with more channels controlling individual effects, unless you are stringing several together, the current draw should be less than 1A per channel (mostly LED's). If that assumption is correct, then I should be able to get by with a single 14AWG input cord. I could always dual cord if I expect the LE to have to drive more incandescents or multiples of something, right?
This leads me to the triacs on the LE. They are rated at 6A. I think that from the stuff that I read, if you are running at less than 1/2 of the rated amps, it should run relatively cool without a heatsink. How is it in the LE in actual practice?
Slightly off of the subject for the last question, but better than opening up another post just for that.