[Ecwid Made Easy.com]

I personally wouldn't order if a quantity said "0".

What about if you did this.

Set all products to limited stock. Set the email when stock is low to say 2.

When the reorderable products reach that level you just switch the stock control to unlimited. You will also need to add a note to the product description saying it is on back order.

Or you might be able to hack this mod: http://www.ecwid.com/forums/showthre...ght=call+price to put up a label saying on back order.