I just finished filling a very large order. In order to get the SKU, which tells me where to find the physical item, I had to print the invoices, open each listing (using the eBid ID number), find the SKU and write it down. Very time-consuming.
The invoice has a lot of white space. Would it be possible to include the SKU under the ID number? I don't know how many characters you allow in the SKU field. If it could get too big, perhaps print the first 10 or 12 characters.