There is a steady flow of all kinds of scull through this site here...
http://noticeboard.rowingservice.com/
They don't always reply when you try to contact them and you have to manually convert the e-mail addresses.(Security measures.)
The Dragon School fleet was flagged up here, but advertised on ebay as " old sculls in rather an obscure section.
I find when browsing ebay it's best to search the whole site, with "Scull," Sculling boat," or "Rowing boat," and accept you may have to find your way through lots of fake rowing prints from America. Worse still is the search engine's habit of 'correcting' your spelling and spewing out lot of 'Crystal Skull' ornaments, candles and other cosplay junk
Essentially you need to set your budget and go for it.
Many 'veteran' scullers will want to buy their own boats, and this is where the main market for wooden sculls exists. For racing purposes really Carl Douglass is about the only person producing wooden sculls, and these are in fact exotic materials dressed up in a wood veneer with a price to match. (Decent condition 2nd hand is @ £3000+) They are also quite twitchy and difficult to balance, so they aren't that popular with heavyweight oarsmen and often belong to lightweights (less than 11 stone) or women.
At 10 stone (ish) you will be able to use most older wooden sculls, especially older , ex School boats. If your speed (in your prime) was less than or close to 2 minutes for a 500m sprint, then you should be able to manage any style of scull, though modern "cleaver" style oars are more difficult to balance due to lighter weight and need a different rowing style. (Front loaded power at the catch rather than a long hard finish.
A lot of clubs are getting rid of their wooden boats due to perceived maintenance problems, although this is in fact something of a mistake. Most wooden boats now for sale are 20+ years old while most plastic boats are dead after 10 with the exception perhaps of the 1980 vintage Janousek boats that are built like the proverbials.
It is also a sad fact that increasing numbers of wooden sculls are being targeted by the Theme pub and companies cutting them up to make useless furniture. This should really only be done when the boat is a write off!
Sculls are surprisingly easy to restore. Most of the stiffness is in the frame which is usually not exposed to sun and frost. The real killer is when they are moved to outdoor racks to make way for the new plastic boats.
After the £1500 + "retirement present / mid life crisis boat, ( think "MAMIL's" with carbon fibre sculls rather than bicycles) the market then falls quickly down to somewhere between "free to a good home," to £500 with everything in between. It's mostly luck, but if it needs a new canvas, or has bad varnish or no riggers or sculls I would seldom pay more than £150
Here is another thought...