求问在湾区herman miller aeron要在哪里怎么买比较划算啊

另外请问这些功能哪些是必须的哪些无所谓呢 我人比较迟钝自己去试估计试不出来
1. back support: basic 或者lumber support或者adjustable postureFit SL
2. Tilt: standard 或者tilt limiter and seat angle
3. Arm: stationary arm 或者 hight adjustable arm 或者fully adjustable arm

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