GOSH (By Superdrug) do a great eyebrow felt 'pen' in brown and black for a fiver. MAC and Stila do the same pens for about fifteen!
I was told by a makeup artist that it's worth spending money on tinted moisturiser (she recommended the Laura Mercier one because you only need a little as the pigment content is high) and foundation - also a good primer. Everything else you can go cheap on. And remember that often the expensive companies and cheaper ones are under the same umbrella so the Bourjois products are practically the same as Chanel.
I use almond oil/vitamin e oil and castor oil to clean my skin - it's never looked better. I realise this isn't to everyone's taste but it works for me.
Rimmel nail polishes - great selection of colours and cheap.
Cien by Lidl - I use their body lotion and deodorant.