Cancel Button! That's great, I am so happy that you added that, I put a mis-priced item up the other day and of course I couldn't do anything about it and I sold an item for 20 fp instead of 20,000 fp like I wanted...
I was listing it on my phone.
I didn't say anything before becasue it was my fault I had typed the 20,000

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and when I went to confirm page I didn't think to recheck the Number since I had just looked at it on the page before. (Huge mistake)
But when it sold and like 2 seconds after I posted it. I wondered why I didn't have all my FP and used the arrow back to see what it had listed the price as & it was 20

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So I did have my FP , but that I had just screwed up royally.
*The Cancel button wont help in cases like this (Buy It Now) because the item will get snatched up to quickly but I know it will help all those who catch their mistake in a reasonable amount of time.
What I learned make double sure you always check the confirm screen, even if you know you posted the correct #'s on the page before! In this case I actually typed the (,) and it canceled it and all the zero's after it, as if it were a (.)