Yesterday I went to my local boots to check out the half price gift sets from Christmas and came across a selection of very cheap perfumes and aftershaves.
Off the top of my head these were some:
Davidoff Echo 100ml for Men: £10
Davidoff Silver Something? for men 100ml: £20
DKNY Be Delicious? for men: £10
Lacoste Spring for women: £10
Diesel for men 100ml: £5
Puma for men 100ml: £5
Burberry for men 100ml: £5
I really can't remember off the top of my head any more but I know there was some Givenchy, DKNY, Lacoste, CK and Davidoff for both men and women and it all ranged from £5-£10 with only the one at £20 I think.
All in store only I believe.