你们发行增刊的优待券吗？

Could you issue the supplement coupons?

我们可以退给您商品优待券吗？

May we pay you back in merchandise coupons?

在这个国家随便哪家旅馆里都可得到这种优待券。

The coupon is available at any hotel in this country.

在顾客购买某样商品后，送他们一张“欢迎再度光临”的优待券。

Present your customer with a "come back" coupon after he purchases something from you.