Just bee to Semi Chem and they have loads of offers on perfumes / aftershave.
United Colours of Benneton 100ml for £1.99
Chaps by Ralph Lauren 100ml £3.49
They also have Elizabeth Arden 30ml, Burberry Womens 30ml, Moschino 50ml, lots more all for under £8, most under a fiver
These are not advertised on their site as they are instore clearance items, I have seen them in 3 different semi chems so hopefully they will be in them all