I did a search on the 2269 -- only one hit on the LAB outside of the above message, and it mentioned that the price for the raw driver was $2250. I'm guessing it's a pretty good driver for that price, but not really practical -- it would seem that JBL really doesn't want those drivers in anybody else's cabinets but their own.
As for the 18" drivers which you can buy, between the JBL 2242 and the B&C 18TBX100, I like them both, but my vote is for the B&C -- close to the same performance for about half the price, and much cheaper to recone as well (though I haven't needed to do that yet).
Unless you really need to save 8-10lbs by going to a neo magnet, the 18TBX100 is pretty close to state-of-the-art. It's a very nice sounding, low distortion driver which also happens to be damn near bulletproof. They're as popular as they are for a good reason.
A couple people on here also recommended Peavey LoRider 18's, which are about $100 cheaper. I've used them, and like them, but for the price difference I'd probably still rather have the B&C's.
It wouldn't hurt to check out the other Italian manufacturers, either: 18sound, RCF (L18P300 is past its prime, though), Ciare. And moving north to Germany, BMS is known for their compression drivers but a number of their woofers look pretty interesting, too.
-Chris