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You might want to stalk the IS300 forum (www.my.is/), they tend to have one for sale every once in a while. Outside of that, if you have someone fabricate a bracket for you the rest should be that tough to fabricate (walboro fuel pump, fuel regulator, intercooler, fuel air/management.) Probably a 7 on a scale of 10.
I have one but I'm not selling since it's gonna go on my car. Oh, for those that thinks the IS300 kit fit on the GS300, they are wrong since you're gonna have to fabricate new piping and make adjustment on a few things.