If a buyer wishes to purchase more than one item they are forced to use the cart.  When they use the cart, there is no option to request an invoice to get combined postage.  I'm sure I'm missing out on sales due to this.  I had one buyer over-pay on postage by more than $10 because they bought 6 items and Ebay wouldn't confirm purchase without payment, and simply added all the postage costs together.  I'm sick of doing refunds.  When we had the invoice request available, if someone overpaid because they didn't ask, I would refund less the Ebay fee.  With buyers not getting the choice to request an invoice, I am now refunding the full amount, so how do I go about getting my fees back on the postage refunds?  Another glitch in the system seems to be the handling time.  Mine is set to 1 day, but I have sales over the last 2 weeks with as much as 5 days handling.  The whole system seems to be very scrambled with new glitches popping up each day.  I'll be bald by Christmas if this keeps up.