[Sticky] A change to the SALES section

The Sales section has now been split into distinct areas.

The aim is to make searching for goodies easier and more focussed. It should help sellers too, keeping items on the first page for longer and not being pushed off by miscellaneous or unrelated items.

At the beginning of every month I'll move SOLD posts to an archive thread along with items that are older than four months or have unanswered questions (on the assumption that the owner has forgotten about the post/it has been long sold/poster has gone away).