Originally Neptune said it wouldn't be under warranty if you purchased it from a third party. How that holds up is another story...
No one says you have to buy it. Just need to be persistent and let a couple forums you frequent know you are looking for one. That is how I picked mine up. Few members here posted in stock alerts and I was able to pick one up. Another one or two members had similar luck that day.
Great product. Well worth the wait if you have an existing Neptune/Apex system.
I don't like it, but I do understand supply and demand. While selling above MSRP is allowed (we're not going to dictate what price someone can sell their stuff for), it is worth noting that flipping corals or equipment (buying something and then turning right around to sell it) is against the rules here on R2R, so no one should be on here buying them and turning around and selling them to make a fast buck.