It can be very annoying trying to sell on eBay,. it seems they try by default to put you into positions advantageous to eBay themselves, they default you into auctions over buy it now , they try and make you by default to the most expensive way to ship .they default you into best offer, they default you into global shipping, you have to click off all of these defaults unless you are a selling pro and most sellers are not.
a good chance the decimal was put in the wrong place defaulting to 45.00 instead of 450.00 mistakes on eBay are not seller friendly
i listed something recently that i started off with a low price because i thought it was an auction listing, but it was a buy it now and was bought within seconds, i honored the mistake because it was only a 25.00 item but if it would have been a couple hundred dollar error then i am sure i would have had to cancelled and relisted it correctly.