Exactly what happened to me
I was very happy with the HD800 and LCD-2's and only bought the 950's to get a "taste" of what the stats sounded like.
Few months later I own the Stax 007 MK1's with a 717 amp on the way...
Koss was hell of a gateway drug for sure... though of course they sound different from Stax. I sold the 950's in order to fund them, but I really did enjoy them while I had them and may very well get another set as soon as I can afford to. They got more of the forward nature that's different from the 007 which is very fun in its own way.
How'd they compare with the HD 800, out of curiosity? (I've heard a lot about the HD 800 - just curious what changes between the two).
Why won't Amazon replace them? Because the price went up? Or because they don't have a stock? Either way - I'd take the refund; it isn't "increasingly hard" to find them, and I think waiting until you can buy them "right" rather than fixing someone else's mistake is a better deal. You aren't "giving away" a one-time deal here. That's how I see it anyways - of course you're a big boy and can do whatever you want, I'm just not keen on the idea of making the mfgr eat something they didn't cause.