CONTINENTAL TYRE AMNESTY: Get a pair for £25

[Tatsunoko]

not retro, but not a bad deal for some fresh rubber - doesn't seem to be centrally advertised (few examples below)

http://www.chelmercycles.co.uk/
or
http://www.shop.18bikes.co.uk/news.php?articleid=178
or
http://www.wheelbase.co.uk/blog/contiamnesty/