For the ultimate savings, ED could be done in about two days or so (east coast)... fly there, pick up next morning, fly back that afternoon.
No hotels, eat in the outgoing plane, at the Welt and at the returning flight for close to free as well.
For somebody not interested at all in the ED experience and in driving in Europe or simply not having a longer time to spend, this could be it.
-2015 F30 320i, Imperial/Oyster, 8AT, ED
-2012 E92 M3 Jerez Black/Rust Brown, M-DCT, ED: Gone
-2008 E90 M3 Melbourne Red/Bamboo, 6MT: Gone
-2007 MK5 GTI United Grey/Grey, DSG: Gone
-2004 E46 M3 Carbon Black/Cinnamon, 6MT: Gone