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That's something that happens a lot, there are different codes advertised that give different prices. For the most part, you should never pay more than $15, there is almost always a sale for $9.99 or $11.99 tops.

You are right my friend after that I never bought any course pricing more than $9.

This is so funny. I haven't encounter this before though but what can we possibly do to stop this rubbish?