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I know it is an explanation, rather than a term. However, it is widely common in malls to find 2.50 or 7.50 LE or the like.

HTH

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Note added at 7 mins (2008-10-18 00:29:58 GMT)
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http://en.wikipedia.org/wiki/Dollar_stores

Definition for dollar store
- store selling inexpensive items: a retail establishment selling inexpensive items, many at one dollar or less

good luck

With this sort of thing, I would not go for a literal translation (since there is none) or an explanation. Here, I would go for brevity and effect -- something that evokes the low prices.

If the phrase occurs in a narrative about the U.S., it would make sense to use the word "dollar" in it, because the reader woudl expect it. For example:

محل أبو دولار

But if the text is generic, this would not work.

If the purpose of the translation is to localize the concept, then a local currency may be worked in. For example:

محل أبو ريال

الخ