Hi Max, and welcome to the forum.
The reason you were unable to post in the Sale/Trade/Wanted section is because that forum is now closed to new posts. We now have our Classifieds section (top right hand tab), although, as a new member, it may block your first couple of posts. It's part of our anti-spam defences.
We have quite a few members in the UK who have San Fran Garters, myself included, although only a few breeders are offering them for sale. Later in the year there will certainly be specimens available, but you might be wise to reserve them now!