I bought mine (230cm) used and was told that that length was special order.
It is a special order but Mariner tries to keep some in stock.
If you don't have elbow, wrist or shoulder problems the bent shaft won't do much for you unless you are touring and paddling super long distances. I have used one for 10 years and will never go back. I dislocated a shoulder and have some upper back problems that the bent shaft relieves enough so I can enjoy my day. I have a bent shaft Skagit composite that they don't make any more for shallow water and a Cyprus full carbon bent shaft for deeper water.
Say what you want about cost but the paddle is your motor and material efficiency is key, the stiffer the paddle the more energy that transfers to the water. So what I transfer in energy in 5 strokes with carbon fiber is closer to 95% of the energy I apply. In comparison when you are using aluminum, plastic and even fiber glass it is lessened to a point that you are using more energy to travel the same distance.