I purchased my 800 over the phone and had it two days later ( Don't hate me! )
I called up Metal Detector Distributors in Brooklyn NY. They are a brick and mortar shop, and not some internet warehouse kind of seller. They had ordered 20, but had only pre-sold 18. I got number 19. $899 including shipping by FedEx. Ordered it on a Wednesday, had it on Friday. The only weird thing is that they don't take credit cards over the phone. They only take PayPal. I ordered, they sent a PP invoice, and then I paid them with a MasterCard via PayPal. Was definitely a different transaction than I'm used to, but it's the way they roll, and it worked perfectly.
I don't know if they typically order more than they have orders for, but it doesn't hurt to give them a call. (718) 649-5872