I have five brand new watches and one slightly used watch for sale. All of them have receipts. If you're reputable, I'd be willing to consider a payment plan of some sort (but you have to be very reputable).
Since I already have them listed on Craigslist, I'm just going to link to the craigslist posts so I don't have to copy/paste a bunch of stuff. If for some bizarre reason that's verboten, sorry.
Tag Heuer Carrera Calibre Five:
http://annarbor.craigslist.org/jwl/3428124599.html
Yellow Tag Heuer Aquaracer
http://annarbor.craigslist.org/jwl/3428173662.html
Bulova Automatic
http://annarbor.craigslist.org/jwl/3428150786.html
FYI, this is a somewhat heavier, thicker bodied watch. If you like a watch with some substance, you'd really like this one.
Wittnauer Men's Metropolitan Watch
http://annarbor.craigslist.org/jwl/3428164458.html
Victorinox
http://annarbor.craigslist.org/jwl/3428185337.html
Bulova Men's Marine Star Watch
http://annarbor.craigslist.org/jwl/3428204432.html
This one is the slightly used one. I really like it and I've worn it around a bit. The clasp is scuffed up a little bit (on the edges, it's sort of hard to see in that light, it's more obvious in person), and the band has some very very minor scratches. It's titanium so I assume it should polish out really easily, but I honestly don't know for sure.
NOTE: if you're looking for a specific make or model of watch, I'm actually going to pick up $3500 worth of watches this weekend, so if you have a special request, let me know and I'll get it to you brand new for less than retail (with receipt, warranty, serial number etc).