Just a thought, FWIW: why not contact QMx and explain your frustrations? Be upfront about this thread, though. Tell them how passionate you are/were about that BDR, and seeing it slip from your grasp set you off like a Roman candle in a bonfire.
It seems that the issue is that you were within reach of a BDR Serenity, and the price jumped up 33%.
The builds are made to order, and we don't really know if the people that have commissioned builds will see the increase or not. So why not call them, ask for someone in authority, and ask? Ask if anyone would be willing to sell their place in the build queue. Ask if they would build you one for the original price. At least you can find out why the price went up!
You've nothing to lose - you'll either get a BDR for what you can afford, or you won't - so you'll be where you are now.