appraise horizon.[co].[uk] - value?

[ExR]

Hi,

I own the domain horizon.[co].[uk] and also horizon.[uk]. Does anyone have any idea as to how much they're worth? I have been offered £4000 for the .co.uk previously which I declined.

Thank you

 

[owntag]

$15k - $30k

 

[ExR]

Thank you

How would be the best place to promote it for sale? I've used Sedo previously but find that buyers generally make silly offers and in the past, a lot of sales have fallen through.