Ya, I saw those - for some reason I thought you could get *just* the clear plastic part. Saw a set of used ones on ebay for cheap too - but can't tell from the picture if they look any better than mine.
I do know of a legal loophole to get around this problem. In Maryland, a vehicle can go from parent to child and vice versa without getting inspected, but not from sibling to sibling. I was hoping to avoid the extra hassle though.
I'm obviously new to the whole BMW thing, so thanks for the help.