I purchased mine the same day I picked up the C18 drill. It compliments the drill nicely, and I have needed it's components on a regular basis. My thinking at the time was since I am investing this much in a Festool
drill, and the Festool
drill utilizes the Centrotec system
, I should consider it an accessory, so I purchased it.
I did not realize until your post that they are that hard to find, but after a search on the internet, I realized they are. I would get it.
As for the price, I paid $299 just over a year ago. I suspect those who were selling it for more than that, raised the price after they became scarce.