I've seen Seagate 60 and 80MB HDDs (some with 8MB cache) advertised for £45 to £50 including VAT - I paid £66 for a 60GB WD600JB (three year warranty) only a few months ago and a fortnight after buying it the spec was upped to 80GB...:-(
Scan of Bolton (click here) has 120 and 160GB drives at around £63 including VAT, but I would avoid the IBM similar models that are even cheaper.
My son had to have two three-figure capacity IBMs replaced because they packed up when used in a server. IBM's response was that the drives were not meant to be run for more than a few hours at a time - not much use in a server...:-)
More prices include 80GB drives for £43 and £45 including VAT from dabs.com:
there was a set of 4 harddisks which were all 4.5GB but one of them was a 2.0 GB harddisk for a laptop.....also i thought i might coment on there was a set of 1400 harddisks for laptops starting bid at 99p.