I was wondering why no paypal for "obvious reasons", to me it's not obvious unless they are stolen--which I'm not suggesting by any means.
Also we have no idea what you consider reasonable. $450 each sounds reasonable to me, as a buyer, for example.
Well since you seem to be new here, there have been notorious scams with paypal and accepting credit cards due to chargebacks and the such.
BTC is a much safer way to do business here and I always use an escrow, as most people selling items here should do for both parties protection.
I have had many offers since listing these and a lot of them were turned down due to mostly new accounts wanting to pay with paypal or credit card even though they were offering more than what I would accept.
$475 is the magic number I am looking for each of these S4's with buyer paying shipping within the USA only.
I have them in hand and they have all been tested and working with no errors whatsoever.
As mentioned and seen in some of the photos a couple of them have cosmetic scratches on the covers, but have no effect on the functionality of the miners themselves.
There are some pictures I posted above with all 4 miners, and a couple I took with pics of them running.
These will be shipping from the east coast of the USA in case you were considering purchasing and trying to figure out shipping costs.
I hope that answers a lot of your questions.
Thanks!