* As cheap as dirt: This is a very common simile, implying something is extremely inexpensive.
* As cheap as chips: Another common simile, this one often refers to food or items that are readily available and affordable.
* As cheap as a used car: This implies something is affordable, but might not be of the highest quality.
* As cheap as a dollar store find: This suggests something is very inexpensive, but possibly of questionable quality.
* As cheap as a free lunch: This is a humorous simile, implying something is completely free and therefore very inexpensive.
The best simile for you will depend on the context and what you are trying to convey.