I wish that I could help, but unfortunately I don't suggest this route. Why? I tried it.
I have a new black Lux Legacy--which I love--and for continuity purposes, I thought it would also be nice to have a discontinued white one in my collection (the white ones were the last to feature the 2100/Diamond Jubilee-style bumper trim).
I drove almost two hours away to buy a new one from a dealer who said that he had found one. Everything seemed legit. When I got home though, I realized that the serial number on the box had been scratched through and did not match the number on the vacuum. "Oh," I thought, "so they changed the box. Big deal." Well, as I unpacked the vacuum, it became immediately clear that what I was sold was not a brand-new vacuum. There were a few tiny, *minor* scuffs on the vacuum body (which wiped away with a magic eraser). The most telling signs though were scratches inside of the plastic wands from vacuuming dirt at high speed and a sticky dirt film on the inside of the hose.
What happened? Well, the dealer that I purchased this from contacted his people and was shipped a "new" old stock vacuum from another dealership. Supposedly. Assuming that this dealer was an honest guy, then he was most likely sent a floor model and was told that it was brand new. It was probably put in the box of a new black model so that whichever dealership it came from ended up with a new black floor model, and I got their white floor model in the black model's box.
When I first found this out, I was furious. I paid full price for someone's used floor model. But the more I thought about it, the more I realized that this vacuum was, more or less, still brand new. It had a black cord which means it was from the last production run of the Legacy prior to the black units being shipped. And it obviously wasn't used much, probably just a few times as a demonstration. So I kept it and didn't complain. It's certainly better than buying a "like new" unit on Ebay (ask me about my problems there), and it's warranted for 10 years like a new vacuum. And the price was reasonable honestly, so I'm ok with it.
The morale of the story... if you go asking around for a new-old Aerus, they will almost surely be able to find one. But don't be disappointed if it comes back as a floor model. If you do go this route, ask them straight up if it was a floor model. If I'd asked, they probably would have admitted it. But I didn't ask.