I absolutely love Real Technique brushes, they are so so soft and not very expensive. These will always be my go to brush, mainly because I have never experienced any hair fall out which is common for a cheap make up brush. I now have the eyeshadow set of brushes, the face brushes and a blush brush.
Real Techniques Core Collection: £13.25
I love Amazon because you can find things so much cheaper on it, it is always the first place I check when I want to buy something because they sell absolutely everything.