Laptop power adaptors

[Dave1984]

The power cable for my Dell Inspiron 5100 has been severed, so I need to get a hold of a new one. Unfortunately the cheapest I've found so far is £28 including shipping, and that's just stupid for a power cable. Haven't been able to find any in town.
Can anyone tell me where (in the UK) I might be able to get one much cheaper?

[Judge]

hmm i fought only Dell dealt with Dell parts mate

[Dave1984]

hmm i fought only Dell dealt with Dell parts mate

Nah you can pick up parts in a lot of places, and loads of places I've seen do sell the particular adaptor I'm after, but they sell at about £45.
So what I'm asking is if anyone knows anywhere in the UK that does them for less than £20ish.