免单的英语

We are having our promo now. Collect 8 stickers on this card, one custermer will be free of charge.

We now have a concession activities, this card knock on the full eight chapters, we can avoid a single individual.

For Normal Operation ,No Credit Sale如果是纯粹翻译的话，建议选择楼上的答案。但若为了店面需要可能我的答案会比较简洁，兼带商业气息。而且最好是几个开头字母用大写 看到楼主补充了问题，又看到楼下不知变通的抄袭……无语了个人认为你说的这种情况反而更应该用“NO”这样语气强硬的词来强调了类似于 公共场合的“No Smoking”和“No Spitting”的说法 或者直接就上“No Credit Sale“，连”For Normal Operation“都可以不要字大点，醒目点，放在显眼位置

For Normal Operation ,No Credit Sale

We currently have a promotion program. Once the card is complete with eight stampings, one customer will be treated free of charge.用stamps或stampings，都可以。stamps/stickers侧重于贴票，stampings侧重于盖章。

意思是：买三送一

保证本店正常经营,请勿赊账To ensure proper operations, our shop will not grant any credits.

free of charge