Hey, TriGreek, and welcome to GreekChat!
My best advice is to check at
The Sinfonia Store periodically. In the past, they have had some very nice coat if arms products. There's not much there in that regard right now—though
this might be along the lines of what you're looking for—but there's been lots of asking lately as to what kind of products brothers would like to see, so I expect to see more. Since you've got until Spring, it might be worth checking periodically.
Also, you might ask his chapter brothers if they know of a good source, especially if any of them have something like you're looking for.
Finally, one word of advice: Make sure anything you get has the restored coat of arms, not the older version. (For background on what I'm talking about, see
here.) This can be tricky, as some places still are using the older version. Even The Sinfonia Store still has items with the older version—I think they're trying to liquidate all of those before getting new products. The wooden shield to which I linked above does have the restored arms.
Good luck!