i want to make the purchase of 4 units you can beat the price?in the publication listed at $ 315 usd per piece, please cotizame sent back to mexico city with zip code 89000. i await your comments. 你好!根据你的要求,我已经帮你翻译了你的需求,以下是翻译结果: 我想购买4个单位,你能给我一个更优惠的价格吗?在发