346.It is impossible for us to supply 3,000 sets for the time being.

347.At present, we can not undertake to entertain your order owning to the uncertain availability of raw materials.

348.We regret that we are unable to meet your requirement for the time being as orders has been full booked.

349.We are sorry to inform you that we are not able to supply these articles for the moment.

350.We are too heavily committed to be able to entertain fresh orders.

翻译：
目前我方无法向贵方提供300套。

我方无法确定原料供应量是否充足，所以目前我们不能接受贵方订单。

货物已经全部订出，目前我方无法满足贵方要求。

很抱歉，这些商品我们暂时不能供应。

向我们订货的人实在是太多了，我们不能再接新的订单了！