Hello Adam,
Thank you for your question about the "Invalid Item Number" message. We jumped on this issue as soon as you wrote and resolved it. Please let us know if you see it again.
Also - instead of cutting and pasting the item number, you can use our "Slam-It" toolbar, located at the bottom left of your Dashboard.
Please let us know if you have any other questions, or require other assistance. We are happy to help.
bidslammer