I had this happen for me first in March or April but I didn't need anything else so I didn't try it. In June however I ordered something and realized later that night I had forgotten something so I ordered it separately instead of dealing with hassle of modifying the original order. Interestingly enough the second order arrived before the first, and for subsequent orders where I have done this 'trick' the second order has arrived days ahead. For my area it seems the extended free shipping is more like 2-day shipping. I have access to same day and next day delivery so it might be different in smaller towns.