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Could anyone explain the difference between helpless and unhelpful? Please give examples if possible.

eg: Any low price is helpless / unhelpful.
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Cambridge says:

helpless
adjective
unable to do anything to help yourself or anyone else:
a helpless two-day-old baby
You feel so helpless because there's nothing you can do to make the child better.
The government is helpless (to act) against these crooks.

"Unhelpful" means "that doesn't improve the situation", or "not willing to help"
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Comments  
JingCould anyone explain the difference between helpless and unhelpful? Please give examples if possible.

eg: Any low price is helpless / unhelpful.
If you are helpless, you are weak, incompetent or unable to help yourself:

We are born into this world naked and helpless.

If a person is unhelpful, they don't (want to) help. If applied to things, 'unhelpful' means that they aren't useful:

The hotel receptionist was totally unhelpful, so we asked to speak to the manager.
Unconstructive criticism is often unhelpful.
Jingeg: Any low price is helpless / unhelpful.
In your example, you could say 'unhelpful' (to me, though, low prices are very helpful!).
Students: Are you brave enough to let our tutors analyse your pronunciation?
Your replies are very helpful. Some explanations from book are unhelpful.

Thank you very much!
 BarbaraPA's reply was promoted to an answer.