I don't understand the system (or lack of it) for combined invoices. I've had several customers tell me that they were unable to do anything bu pay for each item immediately, whereas - in fact just a few minutes ago - other customers have made multiple purchases and the option to send a combined invoice is easily available when I look at my sold items. I did talk to ebay about it some time ago, and I thought they'd fixed the problem, but it happened again recently. Since all my items are set up with the same preferences, I'm at a bit of a loss.