I use USPS whenever I can, but when USPS is about $30+ more than UPS you can self clear, and save the large brokerage fees. USPS is usually around $5.00 Brokerage. In the past I have refused to buy things that are shipped UPS only. With how easy this is I don't have to worry about it.
2012 328i Sport line 6MT
2009 128i, 2004 X3, 2008 128i, 2007 X5