I went through the same thing myself and I highly recommend the ''Naked'' range in Boots - its about €4 each for shampoo and conditioner but they are usually in the 3 for 2 deal so get 2 shampoos and one conditioner. You will have to give it a good 2 weeks of use before you will notice any different as all the silicone has to come out first but then you will notice a difference - It's brilliant
Just reminded me actually I am running low - and seeing as I bought mine at start of November that's not bad going. You will notice you only need a small bit as the lather is something else!!