Also had to re-work section 12 of the Userguide, as it was starting to get a bit big and complicated. It is now made up of 5 sub-sections, with one bit changed to allow members under 16 years to buy stuff at the discretion of the seller (who must state it in their sale beforehand), but still not permitted to sell stuff themselves.

12a - Posting of sales and auctions on this forum is allowed in the sales section, provided the sale conditions are clear and you honour those conditions. Auctions and EOIs are not permitted, but you can post a link to your ebay auction.
12b - Toy dealers and online-stores can advertise here, if in moderation. Protoforms, Members and Distant Sparks will have their sale posting monitored by the Board Staff. This is to verify any odd prices or conditions, as well as to make sure new people don't just take the money and run.
12c - If you are under 16 years old, SELLING here by you is not permitted.
You must have a parent/guardian/adult-member SELL and communicate on your behalf. If you are wanting to PURCHASE from someone here, it is up to the discretion of the seller to sell to a member under 16 years old, but the seller MUST state beforehand in their sales post if they will only sell to members above that age.
12d - All purchases remain your own responsibility. If you don't know someone well enough to risk it, don't buy from them. If you do buy something, communicate politely if there is a delay. Don't start accusations or complain too soon. If patience and communication don't work, contact a third party to help sort out the problem - DON'T argue about it on this public forum.
12e - If you are selling stuff here, make sure you take the job seriously, especially if you are selling multiple items, so that EVERY step of EVERY trade is recorded and trackable. When dealing with (other people's) money, you can't take short-cuts or keep half-assed records.