In reply to your attempt to obtain a supplier, try logging on to 'DATASERV' they are I think cheapest company in the U.K.
They have Laptops starting from around £250.00 inclusive of VAT & Delivery.
I have recently aquired a 12.1" TFT flat panel from them for under £100.00, and I am very satisfied with the way that they do business and the fact that nearly all there refubished unit are covered by a 12 Month RTB Warrenty...
When a laptop is worth as little as £100, people have so much trouble finding a buyer they usually bin it. .... or consign it to the attic. That's your best bet. Aim second hand, and scour the adverts.
You might want to try 'Ad trader'-style papers or something, and/or put an ad in the local classified sections - 'Wanted: laptop for less than £100, can be really low spec, just needs OS and ....'
Maybe an advert in your post office window / Tesco wherever.