I am about to purchase a pair of 2440 drivers. Before buying them I would like to know my options for diaphragm replacement.

On eBay there are noname aftermaket titanium diaphragms from 53$.

PartsExpress sell Radian aluminium diaphragms for 119$. http://www.parts-express.com/pe/showdetl.cfm?Partnumber=294-728.

I cannot find JBL original diaphragms anywhere on the net. Can they actually be purchased?

Any other options?