Are there any WM6 quickbooks compatible programs that keep track of invetory, allow you to do billing on site, etc.

There are a lot of apps that integrate with quickbooks but not many that allows you to list sales of lets say 20 items and then for that to sync and come out of your inventory, Also, am looking for an app that will do real time billing so the invoice can be created on WM6 while on site and then carried over to quickbooks when synced. I do not need over the wire capabilities even though that would be a nice bonus. I can handle daily syncing via USB cord.

Thanks,
Dean