Wait till Amazon drops the price to 250 USD, they do it every year. Especially around November / Thanksgiving / Black Friday. I have seen HD600/650 last year as low as 229 USD. You will probably get them in your hands faster than Massdrop can ship them.
Just my two cents.
Right now (June 28th) Amazon has Hifiman HE-400i for 250 USD (50% off normal price).