I use a £3.50 one from superdrug and its exactly the same concept as the HD palette.. it has 3 shades and a wax then has some mini tweezers and a brush (ok i dont use the tools but they are handy for newbies) and these are also sweatproof and last all day I get so many compliments on my brows and when i show my makeup clients what I use on their brows they are shocked at the price and how good it is... the brand is BeautyUK. And yes the HD one and also browzings are just overpriced eyeshadows, as a MUA i know pretty much about all the formulations of shadows and this is all you need!! I sometimes use my MAC matte eyeshadows (omega, espresso) if I forget my little brow kit and they work exactly the same too, just common sense really.
Im a beauty blogger and done a review on the BeautyUK palette if you'd like to see it drop me a message and ill send you the link