For what is is worth, you may find the occassional used M3 for sale (in US spec form) within Germany or other European countries that are home to US servicemembers of the armed forces.
You will not be able to purchase a truly new from US military sales within Europe, as there are requirements in place to prove eligiblity. There should be a mechaninsm to buy one used, though, and typically the cost will be less than a comparable vehicle in the US. There is the cost to ship though, although you probably figured this into your vehcile.
Just a thought at the cost of used, may offset a potential lost on your 2010.
2009 M3 E93 Silverstone II over Bamboo: 6MT, Tech, Premium, Cold, Premium Sound, Ipod, 19'' Wheels, OEM Exhaust Mod.