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You could also print 2 on an 8x12 ... one simple cut. Your lab could probably handle that without any difficulty (even Wal-mart will trim borders if you ask them to) ... other ways to achieve it as well.
Better idea ... just call (i.e. dinosaur technology ... a telephone) your regular lab and ask how they'd like to best handle it for you, i.e. if they have an 8x8 print, you could put the two inches on one end, again only one simple cut.
It may be an "odd size" and not posted on their "price list", but any reputable lab of your choosing can handle this ... just ask.