[amy2203]

xcart doesn't allow you to sell products that have zero in stock, this is why we have all these mods!

there's 2 things, you can disable inventory tracking completely, then it will just keep selling everything, it has no idea if it's in stock or not, or you can work with the inventory tracking.

there's mods like this, or you could do something like add 5 to y our quantities available, and if qty is less than five show it as pre-order, that way xcart thinks you have it in stock, so it will continue to sell it, but you show your customers that it's pre-order at the moment. The actual number you can vary, as long as it's the same in both areas, as in the amount you add on, (5 or 5000) and the amount at which it shows 'Pre-ORder'

hope that helps,