"I had a diamond J for some time, and deeply regret selling it. I was in a tough spot and needed the cash. *Sigh* I'll find another soon! One of the Best Lux's after the G!"
I'm not gonna venture they are plentiful, but they are out there...especially local craigslist. I got a few on eBay for good prices, but that seems to be over.
Some friendly advice since I've bought/restored over a dozen of them....Elux DJ vacuums from the south have on average, dry-rotted rubber parts....no matter how the vacs were stored. No dig on the south, but I refuse to buy Elux vacs of this vintage from down there. The other caveat is that as these vacs get older and are passed around to Cretans, someone is bound to suck up something wet with either the floor attachment or the PN. This will have consequences to your canister vac and PN internally. How much depends on the incident and the frequency. The cad plated metal parts inside the canister will tell the whole story as the moisture was blown around and rusted the metal....but of course, you most likely won't be able to take the vac apart before buying.
There really isn't any other way to tell that I know of to assess water damage other than at least taking the top off the canister and looking for corroded metal parts.
Kevin