They are equal in price to, if not cheaper than, the ones at the other shops in the street.请分析与翻译，谢谢！
參考答案:他们无论如何不会比街上的其他商店卖的贵了：至少价格相同，说不定还便宜。
这里，if not cheaper than是个插入成分，咱们平常说话也会说的，“即便不便宜的话”。而are equal in price to...是“在价钱上（in price）与...相同”。这个句子就是一个插入语知识点。而且插入语很工整，也可以改一下以便理解：
They are "equal in price to" the ones(指代they)at the other shops in the street,if they are "not cheaper than" the ones at the other shops in the street.