You want something other than a Message Box?
Why not make a Label or Textbox populate with a response that shows the stock left is less than 10?
Do you mean a windows alert? Why make it that complicated? I would go with either a label or message box route.
If intInventoryAmount < 10 then
MsgBox("Note: The amount left is less than 10 units!")
End If
Please provide more details if this is not what you are asking for?