DO NOT use the urine luck. From the sound of it (clean for a year) you are not a heavy user. Urine luck is for heavy users only. If you were to use it, your sample would come back as adulterated. Since your tests are completely random, using someone else's urine is not the best idea because you are going to have to have someone peeing for you all the time or keep some frozen (I don't think I could keep pee in the freezer, of course I have kids and there would be way too many questions to answer).

If they don't pat you down before the test you can reheat the quick fix everyday, rubber band a heat pad to it (you can get additional ones at most stores) and just keep it in your pocket. If you are going to be patted down, you can keep it under your balls, but since I don't have balls, I can't tell you how comfy that is.....