Wotto, that is a good idea to ask them to check/recalculate the postage. A dam good idea indeed and a money saver. 

I try to buy everything from PSPA/Mark C to keep the money in the land of OZ,but every now again, I guess we are all forced to go to the USA guys for those elusive parts.

I find Marks posatge is far better than anyone else, followed by RTBB who is also very very fair.