When you have a very expensive original painting and you confuse it for a cheap knock-off and sell it for a very low cost, this is an example of when you misprice the painting.
transitive verb-·priced′, -·pric′ing
(third-person singular simple present misprices, present participle mispricing, simple past and past participle mispriced)
- To price incorrectly or unsuitably.
mis- +"Ž price