for sell: 为销售

But I'm so sorry that is not for sell.

但是非常抱歉,它是非卖品。

for sale:

出售待售

The house is up for sale.

这所房子正待出售。

It was a 50/50 split. We're putting the house up for sale next week.

我们各分50%。下星期我们就要把房子卖了。

They've put their house up for sale.

他们的房子现在出售。

There are many boats, new and used, for sale.

有许多新船和旧船出售。