At a pet store, that seems to be the going rate for a normal even tho it's wildly over priced. It's up to you what you want to do, personally I would go back and tell them that you were told you were receiving and hypo ball for that price and ask to exchange the normal for a hypo for no additional charge. They are the ones that dropped the ball lying to you.
Here's a pic of my hypo to give you an idea of what one may look like, some have more orange to them. Look for a faded look and really light head.
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