I think it didn't make sense because I thought that he was saying that he paid $30 and was trying to sell it for $30. After re-reading the thread I realized that this is not the case.

Also this probably retailled for $30 even though it says he saw one like it going for $90. The reason is the bottom of the line ones have a 6 hour battery life and a 10 meter range, I know because I looked at every single one frys has.