Advertising rates

I don’t accept much paid advertising on this site. However, it is occasionally possible, depending on how long adverts are currently running for. Here are the current rates:

260px x 200px advert on the right-hand side, below the search box
£20/$25 per month for 6 months = £120/$150

150px x 200px advert in the header
£15/$20 per month for 6 months = £90/$120

300px x 200px advert in the header
£25/$35 per month for 6 months = £150/$210