我们可以用 "affordable ruler" 来表示 "价格便宜的直尺"。
"Affordable" 是形容词，意思是 "负担得起的"，"ruler" 是名词，意思是 "直尺"。
例句：
This is an affordable ruler, perfect for students on a budget. (这是一把价格便宜的直尺，非常适合预算有限的学生使用。)
I bought an affordable ruler, it works just as well as the more expensive ones. (我买了一把价格便宜的直尺，它的质量和更贵的直尺一样好。)
We sell affordable rulers in bulk for schools and offices. (我们批量销售价格便宜的直尺，适用于学校和办公室。)