Do you think this could be a scam?

I'm a little confused as to why you'd think that would be a scam. I guess we're always taking a chance when we sell things online, but that correspondence seems quite professional and it all makes sense. She/he is asking for prices and wants to pay the safest way... either through PayPal or Bank Transfer... doesn't get more honest than that. If they'd offered to send you a check, then I might have questioned it.