We bought 2 second-hand dorians last year, one for me & one for Martin. The MSCA hired out Dorians for the 6 hr event, and made a nice profit, so it is possible they will do this in the future. You can also pay a new dorian off - I think it's $100 per meeting or similar.
There must be a heap of used dorians somewhere - they have sold a lot more than the number of regular entrants. I'll see if I can get the other clubs to track some down.