for sale 还是 for sales

应该是：for sale(待售）；on sale在售; sales（复数）销售量（额），(公司产品的)销售工作；（不可数名词）销售部（=sales department）;sale(单数）销售

His former home is for sale at ?495,000. 他的旧居要以 49.5 万英镑的价格出售。

English textbooks and dictionaries are on sale everywhere. 英语教材和词典到处都有卖的。