Bittawm because I bought from him
You taught me something new today. I've done many deals around here and somehow I have never heard of Bittawm; I was about to go on an entire diatribe about using "reputable escrows", but good thing I did a little research before making a fool out of myself.
You should drop your price on the card if you want it to sell. It's unlikely you'll receive any offers above $450 and that's if you are lucky.
Are you willing to ship the card internationally?