Screwed up on pricing

I just made a mistake with a big order for a client on 500/50 page printed notepads. When originally obtaining the quote from the printers, they provided quotes for 100, 250 and 500 pieces, they gave me the quote for total page numbers however, not printed pieces. For some reason when I relayed the information back to the client, I told them to print 500 pieces would cost $877, but when I got the invoice today it actually cost $1377, I had accidentally give them the price for 250 pieces.

The notepads have already been printed, and I don't know how to deal with this situation. It's going to cost them $500 more than what they thought they were going to pay! In over 12 years I've never made this kind of mistake before, any advice would be very helpful!

Thanks,

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