See, I save money by not getting prime, and just waiting a little for shipping than waiting for a big sale That only works if you aren't buying from Amazon frequently anyway tho.
If the price JUST dropped, you probably won't see another dip for a few months at a holiday sale. I've only seen k712's going for $320-$330 USED. In my opinion, it's worth enjoying a product rather than waiting and hoping not to miss a sale... headphones sound better than cash.
Of course, be responsible with your money if you need it first for food or survival needs.
I am using a family member's Amazon account, so I get the benefits of free two-day shipping for free.
Well, I am not too sure how the price drops work on Amazon. I thought that maybe a vendor would lower the price further, and the others would follow its lead. But if you believe that is the lowest they will go for awhile, I might just get buy them early this morning. Though I do not trust the other vendor's warranties/policies in-case of any mistakes, so I would probably by directly from Amazon themselves.