Combine orders?

Last monday 26 I placed an order, including some Sam&Max and ToMI merchandise.
Since the ToMI Poster Print is backordered, all the stuff is waiting to ship when it's available.
Now, my question is: If next november 4th it's not available yet, can I order my free Wallace & Gromit Collector's DVD, combine the two orders and you send all the items together when ToMI Poster is in stock?
That way you'll send just one package, and I could (hopefully) save some money from the shipping.
Is it possible?
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